10 C. BOVALLIUS. REMARKS ON THE GENUS CYSTEOSOMA. 
One specimen, a female, taken during the Challenger- 
expedition. 
3.. Thaumatops Lovéni. N. sp.: 
(Fig. 1—14). 
The name in honor of Professor SVEN LOVÉN. 
Diagn. Caput longitudine segmenta tria priora pereii equans, altius quam 
longius. 
Segmenta duo priora pereii libera, non coalita. 
Antenne primi paris rectre, dimidium longitudinis capitis equan- 
tes, subter insertae. 
Metacarpi parium duorum priorum pedum pereii processu carpi 
longiores, minute serrati. Pedum pereii quinti paris duplo 
pene longiores illis septimi paris, longitudine corporis multo 
breviores. 
Segmentum ultimum uwri non carinatum. 
Pedunculi pedum wuri ultimi paris ter longiores ramo externo, lati- 
tudine longitudinem ejusdem rami 2Xquantes. Ramus exter- 
nus internum longitudine 2Xquans. 
The head is as long as the three first pereional segments, 
deeper than long. 
The two first pereional segments are free, not coalesced. 
The first pair of antenne are straight, half as long as the 
head, fixed at the under-side of the head. 
The metacarpi of the two first pairs of peretopoda are 
longer than the corresponding carpal processes, finely serrated. 
The fifth pair of pereiopoda are scarcely twice longer than the 
seventh pair, and much shorter than the body. 
The last segment of the urus is not carinated. 
The peduncles of the last pair of uropoda are almost four 
times longer than the outer rami, as broad as the ramus 18 
long. The outer ramus is as long as the inner. 
In general habitus Thaumatops Lovéni shows a great 
resemblance to Th. Neptunus, but the characteristics quoted 
above and in the following lines fully justify its separation as 
a different species. j 
The head is nearly prismatic, the under and hinder mar- 
gins being longer than the upper; it is tumid, but not so 
much as in the other species. From the anterior end, above 
the bases of the antenn&e, a row of 14 very small spines runs 
backwards to the hinder margin on each side. These spines 
