430 Rev. A. M. Norman on an undescribed 



Abdomen a thorace ad caudam gradatim diminuens. Appendix 

 antennarum squamiformis oblongo-lanceolata, apice oblique trun- 

 cato, spina ad marginis exterioris apicem munita ; apex margoque 

 interior dense ciliati ; margo exterior sine ciliis. Thoracis frons 

 rostrata ; rostrum breve, obtusum, vix tertiam oculorum partem 

 superans. Oculi appendicis antennarum tertiam partem vix sequant. 

 Antenna prselongee. Telson (sive lamella caudalis media) apice 

 fisso intermedias fere pervenit lamellas ; fissura brevis. 



Colour very variable, whitish, ashy, green or brown of various 

 shades. Carapace cylindrical. Rostrum short, triangular, not 

 exceeding one-third the length of the eye-peduncle. Antennal 

 scale oblong-lanceolate, with an obliquely truncate apex, three 

 times the length of the eye, and more than twice that of the 

 peduncle of the internal antenna? ; a spine at the apex of the 

 outer margin, which is not ciliated; inner margin and apex 

 densely ciliated. Antennae long and slender. Telson about as 

 long as the intermediate laminae, bifurcate about one-third of 

 its length. 



The most widely diffused species on our coasts ; common in 

 rock-pools. 



My sis Lamorna, R. Q. Couch. PL VIII. figs. 4 & 5. 



My sis Lamornce, Couch, The Zoologist (1856), p. 5286 ; White, Pop. Hist. 

 Brit. Crust, p. 143. 



My sis crassus, sanguineus vel aurantius. Thoracis latera pone 

 multum dilatata. Abdomen lateribus fere parallelis, segmentisque 

 subsequalibus. Appendix antennarum squamiformis obovata, 

 brevis, utrinque dense ciliata, nulla spina instructa. Thoracis frons 

 breviter rostrata. Pedunculi oculorum perbreves, attamen appen- 

 dicis antennarum brevis plus quam dimidium superantes. Antennae 

 prselongee. Telson breve, ad apicem atque per longitudinis tertiam 

 partem nssum,intermediarum dimidium lamellarumtantum attingit. 



Colour " arterial-blood-red " or orange. Carapace greatly 

 widening behind, and U more enlarged posteriorly than in any 

 other long-tailed Crustacean" (Couch). Abdomen of nearly equal 

 diameter throughout. Rostrum short, triangular, one-third the 

 length of the very short peduncle of the eye. Antennal scale 

 ovate, with the apex rounded, very short, slightly exceeding the 

 length of the peduncle of the internal antennae, ciliated all 

 round, and having no spine on the external margin. Antennae 

 long. Telson short, half the length of the intermediate laminae, 

 the bifurcation through half its length. 



This species approaches very near to M. oculatus 0. Fab. 

 {Cancer oculatus, O. Fab. Faun. Green, p. 245; My sis Fabricii, 

 Leach, Linn. Trans, vol. xi. p. 350 ; Thompson, Zool. Researches, 

 Part 1), and may prove to be synonymous with it. 



Rock-pools: Penzance (Couch) ; Falmouth (Norman). 



