CRUSTACEOLOGY. 



431 



Appendix. Cancer various, Oliv.Enc.Meth. H. Nat. tab. vi.p.l 55. 

 v^—y— .J Cancer wyiilorumfuscus, Herbst. \ 



Inhabits Mytilus modiolus. Is common in the Frith 

 of Forth, and was considered as the male of Visum by 

 Dr Leach, until the distinctions of the ciliated lines 

 were pointed out to him by that acute and learned zoo- 

 logist Montagu. 



Sp. 5. Pinna. Front somewhat emarginate ; hands 

 beneath, with an arcuate emargination. 



Male, with the shell transversely, somewhat quadrate, 

 somewhat solid and punctate ; hands ovate, fingers ar- 

 cuate ; sides of the abdomen entire, the last joint abrupt- 

 ly broader than the preceding, the apex acutely some- 

 what rounded. 



Female, shell somewhat transversely, somewhat qua- 

 drate, soft, and very minuteiy punctate ; hands elon- 

 gate-ovate, with the fingers somewhat arcuate ; abdo- 

 men very broad, with a kind of carina of knots, the 

 fifth, sixth, and seventh segments emarginate behind, 

 the last joint narrower than the preceding. 



Cancer Pinnotheres, Linne ? 

 ^_ Pinnotheres pinna, Leach, Mem. Wern. Soc. vol. ii. 

 / Malacos. Britan. Pinnotheres, tab. B. 



Mil's. Montagu, male and female. Mus. Leach, female. 



Discovered by Montagu in Pinna ingens, from the 

 Salcombe estuary; since which, MrCranch has taken two 

 females out of the same shell from the same situation. 



Sp. 6. Modioli. (Male.) Shell transversely, somewhat 

 quadrate, somewhat solid, and punctate ; front emargi- 

 nate ; hands ovate, fingers arcuate ; sides of the abdo- 

 men widely notched, the last joint somewhat abruptly 

 broader than the preceding, the apex obtusely rounded 

 and entire. 



Pinnotheres modioli, Leach, Mem. Wern. Soc. vol. ii. 

 Malacost. Brit. Pinnotheres, tab. B. 



Discovered by Montagu in Mytilus modiolus, from the 

 Kinc-sbvido-e estuarv. Female unknown. 





yr 





7X-^- ,w^fc ^^ ^ /6/S~ ' OCT 



Genus V. Blastus. / 



Sp. 1. Tetraodon. Cancer tetraodbn of Pennant; 

 and also probably Maia armaia of Latreille. 



Genus VI. Pisa. 



Sp. 1. Biaculeata. Cancer bh :ulealus, Montagu, Lin. 

 Trans, vol. ix. 



** Abdomen with six joints. 



Genus I. Inachus. Exterior antennae, with the 

 three first joints largest; eyes distant; feet very long 

 and slender, the anterior pair excluding the arms, thick- 

 er than the three hinder pair ; 3hell somewhat triangu- 

 lar, scantily spined, and rostrated in front, with a pro- 

 jecting spine on each side over the eyes, which protects 

 them as it were in a spurious orbit. 



Sp. 1. Dorsettensis. Rostrum - short and tricuspid, 

 with equal teeth, middle one acute placed beneath ; 

 shell behind the rostrum, with four small equal tuber- 

 cles disposed in a strait transverse line ; behind these 

 three spines, the middle one placed rather more anteri- 

 orly; behind these again, three others stronger and 

 more acute, placed in a recurved line ; the hinder mar- 

 gin, with two distant obsolete tubercles. 



Cancer dorsettensis of Pennant. Cancer Scorpio. Fabr. 

 Ent. Syst. Inachus Scorpio. Fabr. Sup. Ent. Syst. 



Inhabits the western coasts of England. Is common 

 at the mouths of rivers, and in deep water far from land. 



Sp. 2. Dorynchus. Rostrum somewhat lanceolated, 

 with a fissure running down the middle ; shell behind 

 the rostrum, with „ three spines placed in a triangle, the 

 hinder one largest; behind these are two tubercles, one 

 on each side, then four other tubercles, one on each 

 side, and two in the middle near to one another, placed 

 somewhat behind the lateral ones; posterior margin 

 with two distant obsolete tubercles. 



This was discovered by Dr Leach, whilst he was wash- 

 ing some specimens of I. Dorsettensis, sent him by Mr 

 Prideaux and Mr Cranch from the Kingsbridge estuary. 

 Leach, Malacos. Brit. Inachus, 



iia. Exterior antenna?, with the 



eyes distant ; first pair of legs 



bllowing legs ; shell somewhat 



1, anteriorly rostrated ; no spine 



Taia phalangium, seep. 395,'which 

 th Cancer rostratus of Herbst. 

 This differs from Phalangium, 

 longer arid narrower, and the 



th Sound. First noticed as dis- 



Appendix. 



72fe7*~ 



Abdomen with seven joints. 



The genera in this division have been examined but 

 not denned ; we shall, however, give the name of the 

 genera, with one species of each genus. 



Genus 1. Parthenope, Fabricius. 



Sp. 1. Maia Horrida of this article, see page 394. 



Genus II. Maia. 



Sp. 1. Squinado of this article, seep. 394. This spe- 

 cies is improperly mentioned as the Dodecos of Linne 

 by Montagu, in the seventh volume of the Linnean 

 Transactions, when he describes his Cancer maxillaris. 



Genus III. Hyas. 



Sp. 1 . Araneus. Maia Araneus of this article, see p. 394. 



Genus IV. Elrynome. 



Sp. I. Aspcra. Cancer asper of Pennant. As full 

 grown specimens have not yet occurred, we cannot give 

 t-he specific characters. 



4 



I. MACROURI. 



Genus Pen^eus. See page 401. To the generic 

 character add pediform palpi, with five exserted joints, 

 last joint obtuse and simple. 



Genus Alphjeus. See page 400. To this genus, 

 Cancer spinus of So Werby, described in theBritish Miscel- 

 lany, is referable. The pediform palpi with three ex* 

 serted joints, the last joint furnished with spines. 



Sp. 2. Trisulcalus. Back of the thorax with three 

 grooves ; rostrum turning downwards, with two teeth 

 beneath and many above. 



Penceus trisulcatus, Leach, Malacos. Brit. Pen^eus, 

 tab. A. 



Mus. Sowerby. 



Discovered in Anglesea by the Rev. H. Davies, wh» 

 sent it to Mr Sowerby. 



Gen. Hippolyte. Superior antennae with two seta?, 

 the lower seta largest, tke upper compressed ; pediforw 



