177 



coast. It is found in the laminarian region at a depth of a few fathoms, but 

 may easily escape to attention by its small size. 



Distribution. British Isles, ? Mediterranean. 



Fossil. Scotland. 



Gen. 37. Cytheromorpha, Hirschmann, 1901. 



Generic Characters. Shell short and stout, of very firm consistency, with 

 the surface conspicuously pitted. Hinge well developed. Eyes distinctly 

 separated. Anterior antennae with the terminal part 4-articulate, and armed in 

 front with 4 strong spines, last joint prolonged, with one of the apical setae 

 spiniform. Posterior antennae with 2 claw-like spines inside the penultimate 

 joint, apical claws very slender; flagellum of same appearance in the 2 sexes. 

 Mandibular palp with the terminal joint very small, vibratory plate rather fully 

 developed. Maxillae with the masticatory lobes not much prolonged, palp with 

 the distal joint comparatively short. Legs rapidy increasing in length posteri- 

 orly, basal part with 2 unequal setae on the anterior border. Caudal lamellae 

 edged at the tip with 2 bristles. Copulative appendages of male very large, 

 but with the terminal part imperfectly developed. 



Remarks. This genus was established in the year 1901 by Hirschmann, 

 to comprise 2 Cytherids found by him in the Gulf of Finland, one of them 

 being subsequently identified with a Cythere long ago described by Brady. 

 The genus, which is admitted by Dr. Aim, is nearly allied to Cythere, in the 

 restriction here adopted, but differs decidedly in the structure of the anterior 

 antennae, and in the much fuller development of the vibratory plate on the 

 mandibular palp. In addition to the 2 species observed by Hischmann, the 

 Cythere rubida Brady is very probably referable to this genus, and perhaps 

 also some other species described by that author solely from the shell. Only 

 the type species is represented in the Fauna of Norway. 



81. Cytheromorpha fuscata, (Brady). 



(PI. LXXXI). 

 Cythere fuscata, Brady, Ann. Mag. Nat. Hist. Ser. IV, Vol. Ill, p. 47, PI. VII, figs. 58. 



Syn: Cythere dram men sis, G. O. Sars. 

 Cytheromorpha albula, Hirschmann. 



Specific Characters. Female. Shell, seen laterally, short oval or some- 

 what subtriangular in shape, much higher in front than behind, greatest height 

 nearly attaining 3 /s of the length, dorsal margin gibbously arched in the ocular 



22 Crustacea. 



