nyrKUiD-T-:. 313 



the iuforo-anterior margin ()l)li(iuo, waved, and furnislud with 

 strong hail's ; propodos about half the k^f^tli of tlie carpus, arcuate, 

 inner margin double, the most prominent, and fringed with closely 

 set, straight, minute cilia, the outer with many equidistant, long, 

 straight hairs ; dactylos subulate. Second pair of pereiopoda re- 

 sembling the fii'st, but liaving the carpus slightly larger : third p:iiv 

 of jiereiojioda twice as long as the lirst two ; bases stout, posterior 

 and antciior margins parallel ; meros short ; carpus long ; propodos 

 long, straight, slender, and flat, the anterior margin furnished 

 with a eomb-Hke series of teeth that increase towards the distal 

 extremity, and a few solitary e(iuidistant hairs ; dactylos long, 

 slender, shar])-pointcd, and slightly cur\'ed : fourth pair of pereio- 

 poda about half the length of the third, resembling it in foiTn : fifth 

 like the fourth, but not armed wdth fine teeth along the anterior 

 margin of the jDropodos. Ultimate pair of pleoi)oda having the 

 peduncle more than four times the length of the telson, and the 

 rami half a.s long as the peduncle, with the margins scarcely 

 serrated ; penultimate pair reaching a little beyond the extremity 

 of the peduncle of the ultimate ; antepenultimate reaching a little 

 further than the extremity of the penultimate. Telson lanceolate. 

 Length nearly ^ of an inch. 



Bab. Lat. G2°2o' S., long. 58° W. (MS. label.) 



The specimens from which the description and figiu-e arc taken 

 belong to the collection entrusted to me from the Jardin des Plantes, 

 and were prociu-ed during the ' Exi^edition de la Zelce.' The deseri])- 

 tion differs in some respects from that given by Dana ; rather, how- 

 ever, in a1)scnee of detail than in distinction of any essential point. 

 ThiLs, Dana describes the superior antennas as being three-jointed, 

 whereas in my description the second joint is said to be almost 

 covered by the first — in fact, a small portion of the under ])art only 

 being seen. Again, he says that the inferior antennie have the 

 fiiigclhmi a little longer than the fourth joint. The respective joints 

 of the peduncle of the inferior antenna; in this group have not, as yet, 

 been made out; but, in my description, that which Dana calls the 

 fourth joint of the " base " is stated to be the first articulus of the 

 flagellum. Dana does not say whether the flagellum is articulated 

 or not, — an unfortunate omission, as it is one of the chief distinctions 

 between this species as described in this Catalogue and T. (tun-inii. 

 The other discrepancies being unimportant, I have not hesitated to 

 consider this s])ecies as being the same as that described by the great 

 Ameiican carcinologist. 



2. Themisto Giieriuii, n. sp. (Platk L. fig. 9.) 



Sn]H'nor antenna) scarcely as long as the cejjhalon is deep, having 

 th<' first joint of the jteduncle long, the second not covered l)y 



