1904,] ASELLOTA-GROUP OF CRUSTACEAXS. 329 



is placed behind the main portion of the edge (as in the females of 

 *S'. occidentale and *S'. antillense). The " claw " reaches just to the 

 end of the edge ; its lower margin with a number of fine, scarcely 

 serrate spines. 



Abdominal shield slightly longer than broad. The lateral 

 margin unarmed, only with the usual tooth at the notch ; posterior 

 margin strongly and evenly convex, 



Uropoda wanting in my specimens. 



Second joint of the endopod of second male pleopoda increases 

 gradually somewhat in breadth from the base for two-thirds of 

 its length ; the distal oval portion is marked off by small lateral 

 indentations, and the outer portion of its lower surface is adorned ■ 

 with a brush of very short fine hairs ; the margin turning out- 

 wards has a small spine directed forwards a little in front of the 

 indentation named. 



Length of an adult male 4 mm., of the largest immature female 

 3-4 mm. 



Occurrence. Gulf of Siam : between Koh Mesan and Koh 

 Chuen, 38 fathoms (one male) and 15 fathoms (two immatur-e 

 females). The specimens were found in sifted bottom material 

 taken by Dr. Th. Moi'tensen in the beginning of February 1900. 



Remarks. This small slender species is easily distinguished 

 from all preceding forms by the small rounded eyes and the com- 

 plete absence of any process from the lateral margin of the head. 

 First thoracic legs in the male deviate much from those in all 

 other forms hitherto known. 



10. Stenetrium inerme Hasw. 



1881. Stenetrium inerme Haswell, Trans. Linn. Soc. New South 



Wales, vol. V. p. 480, pi, xix, fig, 2 [teste Haswell], 



1882. Stenetrium inerme Haswell, Catal, Austr, Stalk- and 



Sessile-eyed Crust, p, 309. 

 This species is mentioned only for the sake of completeness, 

 because I think that it does not belong to Stenetrium. In his 

 'Catalogue' Haswell describes some characters which raise doubt 

 as to the correctness of his own reference to this genus, the 

 type of which is S. armatum Hasw. ; tracings of figures* in 

 his first paper corroboi'ate this doubt. According to his fig. 2, 

 the first thoracic segment is laterally not produced into an acute 

 process directed forwards as in all other species; in the text 

 (Catal. p. 309) he says : '' Lateral borders of anterior thoracic 

 segments not much produced, bilobed," which thus agrees with 

 the figure. Furthermore, the figure of the maxilliped, the de- 

 scription of the antennulte, having their basal joint " very short 

 and broad," and abdomen, having the lateral margin " entire," 

 thus without notch, all these particulars do not agree with features 

 met with in all other species of Stenetrium ; unfortunately Haswell 

 omits the pleopoda. On hand and " claw " of first thoracic legs 



* Kindly forwarded to me a longtime ago by Mr. R. I. Pocock, now Superintendent 

 of the Zoological Gardens, London. 



