664 



in the specimen examined. Colour, according to Dr. P. Mayer, light greyish, 

 mottled with darker specks. Length of adult male 13 mm. 



Remarks. - - There cannot be any doubt that the C. EsmarW of Boeck 

 is that described by Sp. Bate as C. aquiUlra. Kroyer's description of 

 his C. Janiiarii also agrees in all essential points with the present species, 

 and this is also the case with C. monacantha of Heller. Dr. P. Mayer moreover 

 regards C. olesa of Haswell as identical with this species. It may be readily 

 recognized in the male sex by the enormous prolongation of the anterior part 

 of the body, and by the oblong form of the propodos of the posterior gnatho- 

 poda. A peculiar characteristic first noticed by Heller, is the ventral spine 

 issuing between the bases of the posterior gnathopoda. The very extensive 

 geographical distribution of this species is very remarkable. 



Occurrence. I have not myself met with this form. The figure 

 here given is from a specimen in Boeck's collection labelled C. EsmarJcii- 

 According to that author, it has been found at Bejan in the outer part of 

 the Trondhjemsfjord. 



Distribution. British Isles (Sp. Bate), coast of France (Chevreux), 

 Adriatic (Heller), gulf of Naples (P. Mayer), Azores (Barrois), Atlantic coast 

 of North America (Say), Brazil (Kroyer), Japan (de Haan), Indian Islands 

 (Stebbing), New South Wales (Hasvell), New Zealand (Thomson). 



12. Caprella microtuberculata, Gr. 0. Sars. 



(PI. 239, fig. 1). 

 microtuberculata, G. O. Sars, Crust. & Pycnog. nova in Exped. Norv. collecta. No. 43. 



Body very much elongated and rather slender, especially in the male, 



with slight traces of dorsal tubercles, those in the last 3 segments being 



more conspicuous and exhibiting a similar arrangement to that in C. linear /.v 



and monocera; antepenultimate segment rather elongated, exceeding in length 



the last segments combined. Cephalosome smooth above. Eyes small, 



rounded. Superior antennae exceedingly elongated, nearly attaining the length 



of the whole body, 2nd joint of the peduncle twice the length of the 1st, 



3rd joint u little longer than the latter, flagelluin nearly twice the length 



of the peduncle, and composed of from 20 to 30 articulations. Inferior an- 



tennaj not nearly attaining half the length of the superior, and of the usual 



Anterior gnathopoda rather short and stout. Posterior gnathopoda 



powerfully developed, basal joint widening distally and terminating in 



I font in an acute triangular lappet, ischial and meral joints likewise, acutely 



