ctamidj:. 367 



perior antennoD scarcely longer than the cephalon. Fii-st pair of 

 gnathoi)()(l:i .small, with the ])alni concave, slightly defined ; second 

 pair with the propodos large, liaving the palm concave and furnished 

 with a tooth near the distal extremity. Branchiae more than half 

 the length of the animal, single-branched. Pereiopoda short and 

 robust. 

 Length -^ an inch. 



Hah. Taloahima (Paris Collection). 



Tliis specimen formed one of the collection entrusted to me for 

 description in this Catalogue. 



4. Cyamus ovalis. (Plate LVIII. fig. 3.) 



Cyamus ovalis, Eoussc/, Ann. Sc. Nat. i. (2 s6r.) pi. 8. f. 24. 

 Edwards, Hist, dcs Crust, iii. p. 113. 



Cephalon and first segment of the pereion not so long as the second 

 segment, conical ; second segment longer than the third ; third 

 and fourth slightly wider than the second ; fifth, sixth and 

 seventh gradually narro-ndng. Superior antennae half as long 

 again as the cephalon. First pair of gnathopoda having the pro- 

 podos with the palm concave and defined by an angle : second 

 pair with the palm furnished with two obtuse teeth ; dactylos 

 cui^ved. Branchiae consisting of one long and three shorter branches 

 to each organ. Three posterior pairs of pereiopoda short and strong. 



Length | an inch. 



Hub. Cape of Good Hope. British coast (TFM^e). 



The figure and description are taken from a specimen from the 

 Cape of Good Hope that was entrusted to me from the Jardin des 

 Plantes. 



5. Cyamus abbreviatus. (Plate LVIII. fig. 4.) B.M. 

 Cyamus abbreviatus, Sai/, Journ. Acad. Nat. Set. Philad. i. p. 393. 

 Cephalon and first joint of the pereion scarcely longer than the 

 second joint of the pereion ; the rest of the joints of the pereion 

 not broader than the first. Eyes distant from each other. Superior 

 antenna; not longer than the cephalon. First pair of gnathopoda 

 ha^•ing the propodos long, with the palm not defined, and the 

 dactylos as long as the propodos : second pair ha^^ng the propodos 

 with the palm defined by a small tooth, and armed centrally with 

 a large obtuse one ; dactylos short and curved. Branchiae single- 

 branched, short, being about as long as half the diameter of the 



