95 



SPECIES 



HABITAT 



DEPTII IN 1 ATHOMS 



1. Thalassocaris crinita (Dana). PI. IX, Fig. 22 — 220. 



Regulus crinitus J. D. Dana, Unit. Stat. Expl. Exp. Crust. 1852, p. 599, PI. 39, Fig. 6a— h. 

 Thalassocaris crinitus H. Balss, Ostasiatische Decapoden II, München, 1914, p. 28. 



Stat. 93. June 24/25. Pulu Sanguisiapo, Tawi-Tawi-islands, Sulu-archipelago. 12 m. Lithotham- 



nion-bottom, sand and coral. 1 adult male and 1 egg-laden female. 

 Stat. 99. June 28/29/30. 6°/.$ N., I20°2Ó'E. Anchorage of North-Ubian. 16 — 23 m. Litho- 



thamnion-bottom. 2 ova-bearing females. 

 Stat. 123. North-bay, Biaru-island. 36 — 27 m. Stone and Lithothamnion-bottom. 1 adult male. 

 Stat. 138. August 3. Anchorage on the east coast of Kajoa-island. Plankton, surface. 1 adult 



and 2 young males. 

 Stat. 282. January 15/17, 1900. 8°25'.2S., i27°i8'.4E. Anchorage between Nusa Besi and 



the N. E.-point of Timor. 27 — 54 m. Bottom sand, coral and Lithothamnion. 



1 adult male, 1 ova-bearing female and 1 young male. 



The 1 1 well-preserved specimens, 8 of which are adult and full-grown, make it possible 

 to contribute to our knowledge of this apparently rare species. The rostrum, the postrostral 

 carina of which commences nearly on the middle of the carapace, appears in all the specimens a 

 little less high and therefore a little more slender than in Dana's figure 6a ; it is at 

 first rather strongly depressed and in most specimens runs then horizontally forward to the tip, 

 but in those from the Station 282 the distal part is more or less upturned, especially in the 

 ova-bearing female. In this female and in that from Stat. 93 the upper margin is armed with 

 9 teeth, in all the other specimens, hovvever, with 8, according to Dana the rostrum should 

 be armed dorsally with 9 or 10 teeth; constantly two teeth stand on the carapace behind the 

 orbital margin, the 3 rd above or just before the latter. The dorsal teeth slightly increase in size 

 distally, like also the distances between them, so e. g. in the male from Stat. 93 the anterior 

 tooth is as far distant from the apex as from the penultimate and the latter one-fifth farther 

 distant from the foremost as from the antepenultimate, in the male from Stat. 282, however, 

 the distances between the three distal teeth and that between the foremost tooth and the tip 

 are equal. Like in the female, recorded by Balss from Japan (1. c), in all the specimens the 

 rostrum bears ventrally 3 teeth, while Dana describes and figures 2 only; usually the i st or 

 proximal tooth is the smallest, the 2 nd the largest of the three, in the female from Stat. 282 

 the i st and the 3 rd are equal and a little smaller than the 2 nd ; the ventral teeth are placed 



