coRornirii.K. 205 



4. Cerapus nibriconiis. (Plate XLY. fip;. 1.) D.yi. 



Cerapiis rubricornis, Sdnipaon, Marine Invert. Grand Miuiun, p. 47. f. 'A'-i. 



Male. — Much broader tluin high, tapering at })oth extremities. Ce- 

 phalon about hall' tlic width of the ncfond thoracic segment. Eyes 

 round, black. " Antennio strongly subpedit'orm, curving down- 

 wards and very haiiy ; the inferior ones a little the longer." Fii-st 

 pair of gnathopoda small, subchchform : second pair long ; carpus 

 very large, with the inferior angle produced to a long, sharp pro- 

 cess ; propodos half the Avidth of the carpus, palm waved ; dac- 

 tylos as long as the propodos. The whole of the chelate organ, 

 wlicn closed, is of an elongate-oval form. First and second pairs 

 of pereiopoda small, but with broad flat basa ; third pair shortest of 

 all; fourth and fifth slender, with sharp dactyla. " Antepenultimate 

 and i)enultinuite pairs of pleopoda with long peduncles ; ultimate 

 pair very short, simple, and subuncinate at their extremities. 

 Colour on the back dark mottled grey ; coxa) blackish ; tiagella of 

 the antennae bright red." 



'• Female. — Larger than inale. Superior antennae as long as the 

 inferior. Second pair of gnathopoda not large, with a small, short 

 and ])road propodos ; dactylos short ; carpus produced into a shai-p 

 projection. Colour as in the male, except that the under side of 

 the pereion is of a bright yellow, from the contained eggs." 



Length of female, -^ths of an inch ; " male, 0-41 inch." 



" Hah. Dredged abundantly' on the stems oiBoUenice in 20 fathoms, 

 rocks off Cheney's Head, and in 2o fathoms, off Duck Island. Sjjcci- 

 mens occurred on the 10th of August with eggs, which were hatched 

 on the 2oth of the same month." 



" This species inhabits flexible tubes composed of fine mud and 

 some animal cement, by which it is agglutinated. These tubes are 

 generally adherent to some foreign body for al)out half their length, 

 and closed below. Thej* are mostly found in large groujis, attached 

 to submarine objects and to each other." — (The quotations are ab- 

 breviated from ^timpsor The rest of the description is taken from 

 a si)ecimen sent me by the author.) 



5. Cerapus diifonnis. (Plate XLV. fig. 5.) 



Erichthonius diti'onnis, Edicards, Ann. des Sc. Nat. xx. p. 382 ; Ilist-t 

 dc8 Crust, iii. p. GO. pi. 25). f. 12. 



Male. — Eyes small, round, black. Superior antenna- rather more 

 than half the length of the animal. Inferior antenna? nearly as 

 lung as the superior. First i)air of gnathoi)oda small, having 

 the cai^nis inferiorly deeply arcuate, but not anteriorly produced. 



