664 



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

 mottled with dai'ker specks. Length of adult male 13 ram. 



Memarks. — There cannot be any doubt that the C. Esmarlcii of Boeck 

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

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

 and this is also the case with G. monacanfha of Heller. Dr. P. Mayer moreover 

 regards G. ohesa 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 s])ecies 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 G. Esmarkii. 

 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). 

 Caprella microtuhcrcnlala, G. O. Sars, Crust. & Pycuog. nova in ExpeJ. Norv. coUecta. 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 G. linmris 

 and inoHocvra; antepenultimate segment rather elongated, exceeding in length 

 the last 2 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 a little longer than the latter, flagellum nearly twice the length 

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

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

 structure. Anterior gnathopoda rather short and stout. Posterior gnathopoda 

 very powerfully developed, basal joint widening distally and terminating in 

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



