64 
THE YOYAGE OF H.M.S. CHALLENGED 
Notolopas, Stimpson. 
Notolopas, Stimpson, Ann. Lyc. Nat. Hist. New York, vol. x. p. 96, 1871. 
„ Miers, Journ. Linn. Soc. Loncl. (Zool.), vol. xiv. p. 657, 1879. 
Carapace subpyriform, moderately convex, and rounded posteriorly ; the posterior 
margin more or less distinctly carinated, the dorsal surface bearing a few spines ; the 
orbits have a single hiatus, or a hiatus and notch in the superior margin, and a wider 
hiatus below, and bear a prseocular spine or tooth. Rostrum well developed, with the 
spines coalescent at the base and afterwards divergent. Post-abdomen (in the male) 
distinctly seven- jointed. Eyes short, retractile. Antennae with the basal joint con- 
siderably enlarged with a spine or tooth at the antero-external angle, and often another 
on the exterior margin ; the following joints are slender and are not concealed by the 
rostral spines. The merus of the exterior maxillipedes is distally truncated, with the 
antero-external angle rounded, a little, if at all, produced, and the antero-internal angle 
very slightly emarginate. The chelipedes in the adult male are slender ; palm somewhat 
elongated and slightly compressed ; fingers with but a small intermarginal hiatus. The 
ambulatory legs are very slender, with the joints subcylindrical, the first pair consider- 
ably the longest; the dactyli slightly curved and nearly as long as the penultimate 
joints. 
Species : — Notolopas lamellatus, Stimpson, from Panama and Manzanillo (depth not 
stated), and Notolopas brasiliensis, Miers, described below. 1 
Notolopas brasiliensis, n. sp. (PI. VIII. fig. 1). 
The carapace is subpyriform, considerably longer than broad ; the carina of its 
posterior margin is less prominent than in Notolopas lamellatus and terminates below 
the branchial spines. As in that species, there are two tubercles and a spine upon the 
gastric region ; the cardiac region is slightly convex, there is a strong spine upon each of 
the branchial regions and a median spine upon the crest which defines the posterior 
margin of the carapace. The rostrum is rather shorter than the carapace, the spines of 
which it is composed are at first coalescent, but divergent from a point situated a short 
distance above the base, and they are slender and straight. There is a strong, triangular, 
supraocular spine, and a blunt postocular lobe or tooth. On the pterygostomian regions 
near to the buccal cavity, is an oblique ridge, armed with three strong tubercles. The 
1 The genus Rochinia, noticed and figured but not described by Milne Edwards in his Etudes sur les Crustaces 
Podophthalmaires in the Mission Scientifique du Mexique, p. 86 (footnote) and pi. xviii. fig. 1, is evidently very nearly 
allied to Notolopas, and may be identical with this genus, if the type species, Rocliinia gracilipes, A. Milne Edwards, 
has the posterior margin of the carapace distinctly carinated. This species differs, however, from the two species of 
Notolopas referred to above, in having but a single hiatus in the superior orbital margin, in the more numerous spines 
of the carapace, and the more robust palms of the chelipedes. It was taken at Cape Corrientes, and also near the 
mouth of the Rio Negro in 30 fathoms, and near the Patagonian coast in 44 fathoms. 
