CRUSTACEA AM PHI POD A. 20.") 



The genus Cuma, Edw., has also been proved by Goodsir (Edinb. New 

 Philosoph. Jouru. vol. xxxiv, p. 119) to be a perfect form, since he Las met 

 with females with ova. The place, also, of the genus among the Dccapoda 

 is confirmed. The pectinate branchia? lie, as in these, under the carapace, 

 above the legs, the sexual organs of the male are not apparent ; in the female 

 t he v resemble those of Mysis. The pedunculate eyes are very small, and con- 

 coaled under the carapace, whence it happened perhaps that they were not 

 found by Kroyer. (Vide last Report, p. 283 ; transl. p. 274.) Three species 

 were observed by the author in the Firth of Forth : C. Edicardsii, new species, 

 C. Andouinii, Edw., and C. trispinosa, new species. How far these species 

 agree with those of Kroyer, must be shown from a closer comparison of the 

 descriptions, but it is to be remarked that the author, as well as Edwards, 

 describes, besides the cephalic portion, four thoracic rings, whilst Kroyer, in 

 his new species, counted five. To distinguish it from two new allied genera, 

 Goodsir has thus defined the characters of Cuma : superior antenna?, 1 -jointed, 

 scale-like, inferior antenna? 5-jointed, the double terminal scales of the 

 caudal style 2-joiuted, the last joint the shortest. The two new genera are, 

 (1) Alauna, superior antenna? consisting of a peduncle and a multi-articulate 

 filament ; inferior antennae 8-jointed ; the first three pairs of legs compound ; 

 the internal scale of the caudal style consisting of three segments, the external 

 of one ; A. rostrata, new species. (2) Bodotria, the first five abdominal 

 segments each furnished with a pair of bifurcated finlets ; the two terminal 

 scales of the caudal styles single-jointed. B. arenosa, new species. 



STOMAPODA. 



CAKIDIOIDES. Rathke (1. c. p. 18) has given a more particular description 

 of Mi/sis flcxiiosa (Cane, flex., Mi'ilL), and has instituted a new species, 

 .)/. i tie r mis. 



AMPHIPODA. 



Rathke (1. c. p. 60-85) has enriched this order with two new genera : 

 (1) Liriope, formed from a minute crustacean scarcely 1'" long, Z. pygmcca, 

 several individuals of which were found living in the excretory cavity, which 

 also serves as a marsupial cavity, of the Peltogaster Paguri, a parasitic worm 

 of the Pagurus Bernhardus : the internal antenna? small, with a large whorl 

 of hairs at the root, the external antenna? long, many-jointed. The 

 body elongated, convex above. The first four feet with apparently clawless 

 nippers, the two last terminating in a simple stem, the rest longer ambulatory 

 feet ; the anal feet (six pairs) flat, divided into two branches, and running 

 out into long seta?; two slender, cyliudroid, jointed caudal appendages, fur- 

 nished at the extremity with long seta?. 



