81 



The last pair of trunk-legs are quite unique in form and disposition : tliey 

 arise quite close to the middle line of the body and high up, almost on the back ; 

 they are short, being considerably less than the breadth of the carapace in length, 

 and are very slender and flexible ; and they are so thickly fringed with shaggy 

 hairs as to look like feathers. 



The abdomen in the male consists of 5 separate pieces — the 3rd-5th seg- 

 ments being coalescent : its breadth opposite the penultimate pair of trunk-legs 

 is about one-third that of the sternum at the same point. In the female the 

 abdomen consists of 7 separate segments, and its breadth opposite the penulti- 

 mate pair of trunk-legs is half that of the sternum at the same level. The 

 genital openings in the female have the usual position on the sternum : in the 

 male they are placed at the summit of a prominent tubercle situated at the 

 antero-internal angle of the basal joint of the 5th pair of legs, the tubercle being 

 embedded in a notch in the posterior border of the sternum. 



The carapace of an average egg-laden female is nearly 17 millim. long, and 

 nearly 22 millim. broad. Males are somewhat smaller. 



Colours chestnut brown, carapace lighter : eggs scarlet. 



Bay of Bengal, Coromandel coast 100-250 fms.; Andaman Sea, 185 fms. 



Family PinnoteHcloi. 



PiNNOTEEES, Latreille. 



Pinnotheres, Latreille, Hist. Nat. Crust, et Ins. VI. 78 and in Cuvier, B^gne An. 2nd ed. 1829, p. 48 : Lamarck, 

 (Hist. Nat. An. Siuis V. (2nd edit.) Vol. V. p. 410) : Bosc, Hist. Nat. Crust., I. p. 239 : Leach, Malac. Pod. Brit. : 

 Desmarest, Consid. Gen. Crnat. p. H6 : Milne Edwards, Hist. Nat. Crast. II. 30, and Ann. Soi. Nat., Zool., (3) 

 XVIII. 1852, p. 138 and (3) XX. 1853, p. 216 : De Haan, Faun. Japon. Crust, p. 34: Dana, U. S. Expl. Exp. 

 Crust, pt. I. p. 378 : Bell, British Stalk-eyed Crust, p. 119 : Miers, Challenger Brachyura, p. 275 : Ortmann, Zool. 

 Jahrb. Syst. etc. VJI. 1894, p. 698 : O. Burger Zool. Jahrbncher, Syat. etc. VIII. 1895, p. 362: Adensamer, Ann. 

 Nat. Hist. Hofmus. Wien., 1897, p. 105. 



Pinnoteres ahyssicola, Alcock and Anderson. 9 



Carapace as long as broad, circular, smooth : front rather prominent, about 

 One-fifth the greatest breadth of the carapace. The whole of the eyes and eye- 

 stalks and almost the whole of the orbit are visible in a dorsal view. The eyes 

 are well developed but very pale. The dactylus of the external maxillipeds is 

 styliform, and is inserted at the end of the preceding joint. The lower border 

 of the immobile finger is fringed with fine hairs. The legs are slender : the 2nd 

 and 3rd pairs are both about 1-| times as long as the carapace, and have the 

 dactylus slightly longer than it is in the other two pairs. 



A single female with eggs, and with a carapace about 8 millim. in diameter, 

 was taken by Dr. A. R. S. Anderson from a living individual of a large species 

 of Lamellibranch (Lima indica, E. A. Smith) dredged off the coast of Travancore 

 at a dej)th of 430 fms. 



