lOO 



The full-grown male is 22,5 mm. long, (rostrum 4,6 mm., carapace 5,5 mm., abdomen 

 12,4 mm.), the female has the same size. 



General distribution: Western Indian Ocean (BorradAile) ; Sulu Sea (D.\na) ; 

 Dzushi, Japan (Balss). 



la. Thalassocaris crinita (Dana) var. ' PI. X, Fig. 23 — 23^. 



Stat. 213. Sept. 26 — Oct. 26. Saleyer-anchorage and Surroundings, including Pulu Pasi Tanctte, 

 near the North point of Saleyer-island. Up to 36 m. Bottom coralreefs, mud and 

 mud with sand. 3 males. 



These specimens bear such a close resemblance to those of Thalass. crinita (Dana), 

 described above, that they are provisionally regarded as a variety. 



The largest specimen is about 18 mm. long (rostrum 3,6 mm., carapace 4,1 .mm., 

 abdomen 10,5 mm.). Rostrum in a lateral view as in the typical form, but only 7 teeth dorsally, 

 2 of which, however, stand also on the carapace, and there is also a small tubercle at the base 

 of the I"' tooth; lower margin with 3 teeth, the 3'^'^ placed just in front of the anterior tooth of 

 the upper. The upper margin runs downward as far as the anterior tooth, the distal remaining 

 part horizontal. When the carapace, however, is looked at from above, the basal dilatation of the 

 lateral carinae appears much smaller, only i mm. broad, in the typical male from Stat. 93, 

 however, which has the same size, the dilatation appears one and a half as broad, namely 

 1,5 mm.; the lateral margins converge also less strongly backward than in the typical 

 specimen, for in the latter the width at the base of the dilatation is 1,12 mm., in the male from 

 Stat. 213, however, 0,86 mm. The second specimen agrees with the described one, in the third 

 the rostrum is broken off. For the rest carapace and abdomen full\- resemble those of the 

 typical species and even the transverse wrinkles below the supra-orbital spine are distinct. 



The other differences are the following. While the ischium of the 2"*^ leg's agrees with 

 that of the typical form, the merus does not show the obtuse prominences on its margins and 

 the upper border appears quite straight and misses even the short spiniform setae, which 

 in the typical species stand on the prominences. The carpus is more narrowed pro.ximally 

 and the obtuse tubercle is absent, like also the notch behind it. Though the measurements 

 of the legs of the 3"* pair are typical, the dactyli more resemble those of the female. The 

 dactyli, indeed, here also half as long as the propodi, are about 7-times as long as broad, 

 narrow gradually and end in a stylopodite that measures Yo ^^ whole length of the joint ; the 

 upper margin has no spines, along the posterior 10 spinules occur at subequal distances and 

 the spinules slightly increase in length. Dactyli of the following legs like those of the 3"' pair, 

 those of the 5''' pair with 7 spinules on the posterior margin. 



Family Paxdaudae. 



The family Pandalidae, nowadays represented by a hundred species and a few varieties, 

 includes the following eleven genera: Panda/us Leach, Diclielopandaliis Caul!., Pandaliiia 



