274 " THETIS " SCIENTIFIC RESULTS. 



The differences in the second pleopod are very marked ; in C. 

 crassicaudata (fig. 35) they are much larger, tlie stylet being very 

 remarkable for its length, curvature, and corrugated muscular 

 band ; the latter is situated on the inner side of its distal half, 

 and in its present contracted condition prevents the stylet fi^om 

 being straightened out. 



Obtained off Botany, Jibbon, Port Kembla, Crookhaven River, 

 and Wata Mooli. 



BREGMOCERELLA, Haswell. 



BREGMOCERELLA GRAY AN US, Woodward. 



New Isopod, Woodward, Rep. Brit. Assoc, for 1869 (1870), 

 trans, sect., p. 118 (title only). 



Ceratocephalus grayanus, Woodward, Encyc. Brit., ninth edit., 

 vi., p. 659, fig. 72. 



Ceratocephalus grayanus, Beddard, Chall. Report, ZooL, xvii., 

 1886, p. 148. 



Bregmocerella tricornis, Haswell, Proc. Linn. Soc. N.S.W., ix., 

 1885, p. 1004, pi. liii., fig. 1. 



Stations 33, 35. 



In the year 1869 Mr. H. Woodward read a paper "On a new 

 Isopod from Flinders Island." The same author briefly describes 

 and figures the species in the Encyclopaedia Britannica under the 

 name of Ceratocephalus grayanus, a MS. name given by Adam 

 White. 



In 1885 Mr. (now Prof.) W. A. Haswell redescribed it as Breg- 

 mocerella tricornis. Mr. Woodward, in publishing A. White's 

 MS. name, apparently overlooked the genus C eratocephala, which 

 was erected by Warder in 1838 for the reception of a Trilobite.* 

 Under the circumstances the equally expressive Bregmocerella 

 must replace Ceratocephalus as the generic name. 



There are a few important characters which have not hitherto 

 been fully described, viz., the mouth parts and the pleopoda. 

 Mandibles stoutish, about twice as long as broad ; cutting edge 

 blunt, unidentate. subtended below by a small compressed lobe 

 and a corneous column, upon which a cluster of short simple 

 spines are seated ; the spines are about one-third the length of 

 the column. Molar tubercle ill-defined, its transverse diameter 

 is less than the length of the apical denticle. Palp rather short, 



* J. A. Warder — Aiiier. Journ. Science, xxiv., 1838, p. 377. 



