CRUSTACEA. 
81 
Section TRIGONA, Latr. 
Genus PARTHENOPE, Fair. 
7 . Parthenope punctatissima. n. s. 
Parth. clypeo rhomboideo punctatissima , chelis longissimis , trihedris, angulis dentatis. 
Long, clypei, lin. 6. lat. lin. 7. 
The carapace of this species is rhomboidal, universally punctate, and traversed longitudinally by 
two deep and broad furrows. The middle elevation is produced anteriorly in form of a rostrum, along 
the middle of which is a slight linear depression ; posteriorly it is truncate, with the angles 
spiniform. 
The lateral elevations are carinate, and each terminates posteriorly in a spine. The anterior 
margins of the carapace arecrenate, the divisions increasing in size as they approach the lateral angles, 
which are spiniform, so that there are six spines altogether at the posterior part of the shell, being 
three less than in Parthenope Regina, Fabr. ( Entom . Suppl. p. 353.) The middle elevation of 
the caudal joints is slightly indicated, and is without teeth ; the last joint is triangular. The chela 
are twice the length of the shell, trihedral, with the sides equal, and shagreened. The dentate 
character is most distinct on the superior angle of the ulna ; the superior and anterior angles of the 
manus are deeply crenate and ciliate ; the fingers are ciliate, the pollex is curved, [and internally 
tuberculate, the digitus (4) dentate and sharp-pointed. The claws are subequal, simple and slender. 
This single specimen, a male, was taken by Lieutenant Belcher on the coast of California. 
Plate XXIV. Fig. 4. Parthenope punctatissima. 
MACROURA, Leach, Latr. 
Section ANOMALIA, Latr. ( Cuv . Regne Anitn. 4. p. 73. nouv. ed.) 
Genus PAGURUS, Latr. Leach. 
8. PAGURUS Streblonyx. Leach, Malacostraca Podophtlu Brit. tab. 26. jig. 1—4. 
Two specimens were taken at Kamtschatka, which have the twisted claws, and all the other 
characters of Streblonyx save that of colour, being of a dirty brown hue. 
The manus of the left chela of one of the specimens was of a more regular trihedral form than in 
our common Hermit crab, but this character was less marked in the other specimen. They are beset 
with minute Spirorbes, which very commonly infest the Arctic Crustacea. 
9. Pagurus splendescens. n. s. 
Pag.fuscus, colore viridi nitens ; chelis longitudinaliter tuberculatis, sinistrce digitis valde elongatis. 
Long. curp. unc. 3). 
This singular species has a couvex and heart-shaped thorax, tridentate in front, with the middle 
tooth produced, and some smaller dentations behind the lateral teeth. This is divided, as is usual 
in the Paguri, into a cardiac and branchial region, but the line of demarcation splits to include a 
small elliptical portion on either side; the anterior angles of the branchial region project forwards, 
M 
