ovMMAniD.i:. 109 



curved. Socontl pair of gnathopodii a little larger than the first, 

 having the propodos scarcely as long as the carpus; palm straight, 

 at right angles vrith the superior and inferior margins ; dactylos 

 furnished with a tooth upon the concave surface. Two anterior 

 pairs of pcreiopoda stout and powerful ; coxa) deeper than the 

 prececHng, and developed inferiorly to an angle, the second being 

 deeper than the fii-st; the rest of the joints cylindrical; meros 

 and carpus short ; propodos longer ; dactylos long, sharp, strong, 

 clean, curved. Three posterior pairs of pereiopoda having the 

 coxa3 produced deeper posteriorly than anteriorly ; basos dilated, 

 ovate, inferiorly produced to cover the ischium ; meros slightly 

 dilated ; carpus and propodos cylindrical ; propodos not much 

 longer than the carpus, and furnished anteriorly vnih. a few 

 spines; dactylos like the preceding. Three posterior pairs of 

 pleopoda subequal, clean. Telson lanceolate. 

 Length ^ths of an inch. 



Eab. Banff (Mr. Edward) ; Macduff {Mr. Gregor) ; I'olperro {Mr. 

 LoiKjhrin). 



The colour of the specimens that wore sent to me from Scotland 

 was dark brown, those from Polperro paper- white; these latter 

 have also since become brown ; hence we may assimie white to be 

 their natural colour. The specimens sent to me by Mr. Loughrin 

 were also thickly covered by a species of Vorticella, a cu'cumstanco 

 that denotes at least a peculiar habitat. I received them in the 

 same bottle with some parasitic Crustacea taken fi'om the throat of 

 the Cod and skin of the Picked Dog-fish ; but, as Mr. Loughrin made 

 no special note of these, I am not prepared to affirm whether or not 

 they are parasitic. The form of the dactylos of each pair of pereiopoda 

 bears a strong resemblance to that of jiarasitic Isopoda, and must be 

 vciy efficient for hooking-on to the skin of any animal; but it is difficult 

 to suppose that the dehcate Vorticella coid.d remain attaclied eitlier 

 in the throat or upon the externid sui'face of a fast-swimming fish. 



25. LAFYSTIUS. 

 Lafystius, Kroyer, Tidskr. 1 eer. vol. iv. p. 156, 1842. 

 " Ccphalon depressed, produced, broader than long. Antenna? rather 

 short, subulate, strong (superior the stronger) ; peduncle and tla- 

 gelluni about equal in length, placed beneath the rostrum in the 

 same plane, one before the other. Eyes situated doreally on the 

 surface of the cephalon. Mandibles narrow, pointed, furnished 

 ■with an appendage. Maxillipeds with u biarticulate palpus. 

 Thorax broad, depressed. First pair of gnathopoda slender; 

 propodos linear; dactylos long. Second pair of gnathopoda short, 

 strong ; propodos quadrate ; dactylos subhuninar, apex setose. 



