308 CARL BOVALLIUS, AMPHirODA HYPERIIDEA. I. 2» HYPERIID^E. 



Euthemisto compressa. 



articulo lrao perangusto, non dilatato; articulo tertio magis elongato qvam apud speciera ante- 

 cedent em. » 



In 1872 he repeated the two diagnoses, and gave a closer description of Themisto 

 bispinosa, from which I translate the following passage: 



»The fifth pair of legs are a little longer than the following; its first joint is only feebly 

 dilated, with the front margin convex and the hind straight; its third joint is very short; the 

 fourth is narrow, scarcely more than four times as long as broad, and is provided with bristles 

 on the front margin; the fifth joint is much longer, and is finely serrated along the front margin. 

 The last two pairs are shorter; their third joint is narrower and somewhat longer; the fourth 

 and fifth joints are shorter and narrower than the corresponding joints in the fifth pair. This 

 species is very similar to the preceding (= Parathemisto compressa) in the form of the urus and 

 of the uropoda.» 



In 1878 Spence Bate described and delineated under the name Lestriyonus spini- 

 dorsalis an animal which certainly belongs to the present species. In the same year he 

 changed the name into Hyperia spinidorsalis. 



In 1887 Hansen, as I have said above, rightly /united Parathemisto compressa, Goes, 

 and Euthemisto bispinosa, Boeck, under the name Euthemisto compressa, Goes. 



The m a 1 e. 



PI. XIII, fig. 32—43. 



The body is compressed, the peraeon scarcely being broader than the pleon. A 

 strongly developed median carina runs on the dorsal side from the front margin of the 

 first pergonal segment to the hind margin of the first ural segment, often, but not al- 

 ways, projecting into sharp angular processes in the last two perseonal segments and in 

 the first pleonal. The integument is thin and nearly pellucid. The head and peraeon 

 together are about as long as the pleon and urus together. 



The head is much more compressed than in the species of Hyperia and Hyperiella, 

 nearly twice as deep as it is broad. The upper and front sides form a semi-circle. The 

 antenna! groove commences considerably below the middle of the front margin, and is 

 comparatively short. The under side of the head is short, and evenly rounded. 



The eyes occupy the whole surface of the head, and are separated at the crown by 

 a very narrow stripe. 



The first pair of antennae (p. 305 fig. 3) reach to the hind margin of the fourth 

 pergonal segment. The first joint of the peduncle is almost globular, and is nearly twice 

 as long as the two following joints together; the second and third joints are about equal 

 in length. The first joint of the flagellum is elongate-conical, and only a little tumid; 

 it is more than twice as long as the whole peduncle, and is fringed with long olfactory 

 hairs along the inner side; the second and third flagellar joints are very short, being 

 scarcely as long as broad; the fourth, fifth, sixth, and seventh increase in length, 

 the nine following are equal in length, very long and slender, and about twenty times 



