444 



vided with 2 small apical hairs, and has moreover a slender bristle ex- 

 teriorly. 



Occurrence. — Numerous specimens of this beautiful form were taken 

 by Dr. Grimm in the southern part of the Caspian Sea, from the consider- 

 able depth of 108 fathoms. 



10. Amathillina Maximowiczi, G. 0. Sars, n. sp. 



(PI. 5, figs. 1—14). 



Specific Characters. — Body somewhat less slender than in the preceding- 

 species, with the mesosome not at all carinated dorsally. Each of the seg- 

 ments of metasome elevated to a comparatively low dorsal expansion, that 

 of last segment not differing from the other 2. Lateral lobes of cephalon 

 very short, and obtusely truncated at the tip. Auterior paii'S of coxal plates 

 comparatively small. The last 2 pairs of epimeral plates of metasome slightly 

 produced at the lateral corners. Urosome without any dorsal projection. 

 Eyes oblong oval. Superior antennau fully twice as long as the inferior, ac- 

 cessory appendage triarticulatc. Gnathopoda of the usual structure. Perciti- 

 poda comparatively short and stout, and having their outer part edged with 

 fascicles of slender bristles; basal joint of penultimate pair unusually broad, 

 that of last pair expanded at the infero-i)osteal corner to a very prominent 

 rounded lobe extending in female to the middle of the meral joiut. Last pair 

 of uropoda with the outer ramus almost twice as long as the basal ]iai't. 

 Telson less broad than in the preceding species, each half with 2 slender 

 apical spines. Length of adult female scarcely exceeding 6 mm. 



Eemarlcs. — This form is at once distinguished from the other known 

 species by the very slight development of the dorsal crest, which is only 

 confined to the metasome. Moreover, the short and stout form of the pereio- 

 poda, and the shape of the basal joint of the posterior pairs may serve for 

 easily recognizing the species. I have much pleasure in dedicating this form 

 to its discoverer Mr. Maximovicz. 



Description. — The length of fully adult female specimens scarcely ex- 

 ceeds 6 mm., that of male specimens is, as usual, somewhat more. But this 

 form is in every case far inferior in size to the 3 previously described species. 



The form of the body (see fig. 1), especially in the female, is rather 

 short and stout, and somewhat tumid in the anterior part. The dorsal crest, 

 so highly developed iu most other species, is in this foi-m confined to the 

 metasome, and is there rather low, each of the 3 segments having a rather 

 slight dorsal expansion fringed with small hairs. The hindmost expansion is 

 somewhat less prominent than the other 2, but of an exactly similar triangu- 

 lar form. 



^►us.-MiiT. CTli. 27.1. 24 



