532 



BULLETIN 129^ UNITED STATES NATIONAL MUSEUM 



THYROLAMBRUS ASTROIDES Rathbnn 



Plate 196; plate 280, figs. 5 and 6 



. Thyrolamhrus astroides Rathbun, Proc. U. S. Nat. Mus., vol. 17, Mar. 30, 

 1894, advance sheet, p. 1; July, 1894, p. 83 (type-locality, off Havana, 

 Cuba, 67 and 189 fathoms; holotype. Cat. No. 9507, U.S.N.M.). 



Thryolamhrus [by error] astroides Nutting, Bull. Lab. Nat. Hist. State Univ. 

 Iowa, vol. 3, 1895, p. 77, plate facing p. 76, fig. 2 (male). 



Parthenope (Parthenomerus) efflorescens Alcock, Journ. Asiat. Soc. Bengal, 

 vol. 64, 1895, p. 281 (type-locality, Andaman Sea, 36 fatjjoms; type in 

 Indian Mus.). 



Parthenope efflorescens Alcock, IUus. Zool. Investigator, Crust., pt. 4, 1896, 

 pi. 22, figs. 5, 5a (female). 



Diagnosis. — Reticulation of surface very rougli, frost-like. Pos- 

 tero-lateral margins meeting posterior margin at an oblique angle; 



teeth acute. Chelae armed on the inner 

 side with two rows of long spines. Hand 

 slender; fingers slender, of subequal length. 

 Description. — Entire surface covered 

 with a lace-work or frosting, formed by the 

 partial contact of very delicate crisply 

 paxilliform granules (Alcock). Carapace 

 about two-thirds as long as wide, thick, 

 slightly wider at postero-lateral than at 

 antero-lateral angles; frontal and antero- 

 lateral regions almost perpendicular; pos- 

 terior margin making a very oblique angle 

 with postero-lateral margin. Besides the 

 large pits everywhere present, there are 

 other, larger depressions; a deep hollow 

 between orbits is continued backward by a 

 shallow sulcus on the mesogastric region; 

 a deep depression at inner branchial angle ; 

 cardiac elevation small and nearly isolated; a deep linear furrow in 

 front of posterior margin; hepatic region small and well defined. The 

 granular ridges between pits are raised at intervals into small, acute 

 tubercles. 



Rostrum arcuate in dorsal view, produced downward at the middle 

 in a small, triangular, denticulate tooth which is prolonged backward 

 to the interantennular septum. Orbits small, circular; eye-stalks 

 covered with stellar granules and with a row of three or four spinules 

 on the upper side next the cornea. Subhepatic region laterally pro- 

 duced in a triangular tooth. Antero-lateral margin of branchial 

 region armed with seven or eight small, granulated teeth, each with 

 a median ridge, postero-lateral margin with three shallower, more 

 distant teeth. Antero-internal angle of basal antennal joint barely 



Fig. 147. — THYROLAMBRUS AS- 

 TROIDES (9515), MAXILLIPED, X 12 



