302 AMPniPODA ABERBANTIA. 



upon which are numerous spots and patches of sulphm'-whitc 

 irregularly distributed. 

 ** Length 1 inch. 



"Hab. Dredged in gi'eat numbers, adhering to Gemellaria dumosa, 

 in 10 fathoms, off Cheneys Head, GrandManan." — Stimpson. Belches. 



The description of this species is taken from Stimpson's work 

 quoted ; the figure is from a di'awing by^Professor Westwood in the 

 ' Last of the Arctic Voyages.' 



20. Caprella longicollis. (Plate LVII. fig. 4.) 

 Caprella longicollis, Lucas, Algerie, f. 4. 



First segment of the pereion long ; second as long as the first. Su- 

 perior antennae half the length of the animal : inferior one-thii'd the 

 length of the superior. First pair of gnathopoda short : second very 

 long, having the basos long, the propodos long-ovate, palm about 

 haK the length of the propodos, concave, dactylos slightly arcuate. 



Length |- of an inch. 

 Hah. Algeria. 



21. Caprella sequilibra. (Plate LVII. fig. 5.) B.M. 



Caprella equilibra. Say, Jmirn. Acad. Philad. i. 

 Caprella Januarii, Krmjer, Voy. en Scand. pi. 6. f. 15. 

 Dana, U. S. Expl'ur. Exped. p. 819. pi. 55. f. 2. 



First segment of the pereion veiy long ; second longer than the first, 

 furnished posteriorly with a straight tooth in the ventral medial 

 line ; three succeeding segments subequal ; last two very short. 

 Eyes small and round. Superior antennae not half the length of 

 the animal ; fii'st joint longer than the cephalon ; second more 

 than twice the length of the first ; third about half the length of 

 the second, and not tapering at the extremity ; flagellmn about 

 half the length of the third joint of the peduncle, and suddenly 

 narrower. Inferior antennae not half the length of the superior. 

 First pair of gnathopoda very small, and situated close to the 

 cephalon : second pair attached to the posterior extremity of the 

 second segment of the pereion, and near the centre of the animal ; 

 basos not longer than the pereion is deep; propodos more than 

 half the length of the second segment of the pereion, long-ovate ; 

 palm two-thirds the length of the inferior margin and subparaUel 

 with the superior margin, defined by an acute tooth, and armed 

 anteriorly wath a large triangular tooth or process, and a small 

 denticle (not constant : Say) immediately posterior to the process. 

 Three posterior pairs of pereiopoda short. 



Length | of an inch (11 inch, Dana). 



Hah. South Cai-olina, U.S. {Sarj): Northern ^eos {Kroyer) ; Hong- 



