CAPRELUDiE. 303 



kong (Mr. JI((rri>u/ion) ; Kio Janeiro, from the anchor, in 10-12 

 fathoms(Z>c</ia); Plymouth lSouml(C'.Ab'.^.);Scaham('ii;«;y.^.i\'or)HaH). 



On a careful comixirison of Say's type, presented by him to the 

 British ilnscum, with the specimens brought from Hongkong by 

 Mr. Harrington, and with that taken by myself from a buoy in 

 Plymouth Sound. I have not been able to detect the slightest varia- 

 tion ; and judging from Kriiyer's figure of C. Januarii, the associa- 

 tion appeal's to be as near. Dana describes his specimen as having 

 the ])alm of the second ])air of gnathopoda pu])escent ; but in all 

 other respects his description corresponds with that of the Northern 

 fonus. 



If, as some naturalists suppose, it is impossible that animals from 

 such distant localities can belong to one species, the coincidence of 

 form is curious, since the one description and figure wiU serve for 

 all four. 



22. Caprella globiceps. 

 Caprell<a globiceps, Datia, U. S. Explor. Exped. p. 820. pi. 55. f. 3. 



" Body rather slender ; second, third, fourth and fifth segments of 

 the pereion subequal, somewhat oblong. Cephalon rounded, twice 

 as long as the next segment. Superior antennae pubescent, rather 

 longer than half the body, and more than twice as long as the 

 inferior ; first joint a little shorter than the second ; flageUum with 

 from ten to twelve articuli, hardly shorter than the peduncle. 

 Inferior antennae quite short (much shorter than the jjeduncle of 

 the superior), ciliate. Branchiae oblong. Propodos of the second 

 pair of gnathopoda oblong; palm pubescent, nearly straight 

 prominence towards the base. 



" Length \ an inch. 



" Hah. Pao Janeiro, in 10 to 12 fathoms ; taken from the anchor 

 with the preceding." — Dana. 



23. Caprella tenella. (Plate LVII. fig. 6.) 

 yEgina ? tenella, J)aua, U. S. Explor. Exped. p. 822. pi. 55. f. 4. 

 " Body very slender. Cephalon subacute in front, but not produced 

 into a beak, longer than the next segment. Second segment of 

 the pereion shorter than cither of the three foUowing, armed with 

 spines on the middle and posterior margin of the back ; third 

 aculeate at the posterior margin only ; remaining segments un- 

 armed. Superior antenna) slender, much longer than half the 

 body ; first joint half as long as the second ; flagcUum articulated, 

 a little shorter than the peduncle : inferior antenna) harfUy longer 

 than the peduncle of the superior. Propodos of second pair of 

 pnathoporla narrow nblong, with a brf)ad, (jbli(|ucly truncate apex ; 



