have been ca]jtured, for, as far as I am aware, only three have been obtained until at present. 

 Firstly the tvpe specimen, long 187 mm. (carapace 82 mm., abdomen 105 mm.), described by 

 me in 18S1 and figured in 1882, which was taken in the sea near Benkulen (Sumatra) and 

 which is still preserved in the Leyden Museum, 2" a specimen, long 133 mm., from Mauritius, 

 described by Gruvix (1. c.) and preserved in the Museum of Paris, 3" a specimen also from 

 Mauritius and preserved in the British Museum, London. The three specimens are all of the 

 male se.x, the female is still unknown. Unfortunately nothing is known about the depth, at 

 which these specimens have been captured and I do not know whether the vertical distribution 

 of the West-Indian representative of this genus, Palimirellus Gundlachi von Mart., with which, 

 according to Dr. Ort.manx (1. c), Synaxes hybridica Sp. Bate should be identical and which seems 

 to be also a rare form, has been observed or not. 



My descriptions of 1S81 and 1882 do not indicate whether the abdominal terga are 

 carinate in the middle line or not, but on Plate i of my dutch description the 2°'' — 6''' terga 

 like also the anterior part of the telsbn present a narrow band or stri])e in the middle, that 

 is smooth and devoid of the small tufts of very short hairs, which occur on either side of it : 

 one cannot conclude, however, from this figure whether these narrow glabrous bands are carinate 

 or not. I therefore applied to Dr. R. Horst of the Leyden Museum, who kindly reexamined 

 for me the type specimen and wrote me the following. The 2'"', 3'^ an d 4'^ t e rga a r e 

 indeed f u r n i s h e d with a s 1 i g h 1 1 )■ c o n v e .x , median carina, which , however , 

 gradualK' disappears backward, so that the ^''^ and the (j^"^ terga can hardly more be said to 

 be carinate, for they only present in the middle a glabrous stripe. This glabrous stripe does 

 not occur on the telson, so that my figure of the latter is inaccurate in this respect. These 

 ob.servations now fullv agree with those made by Gruvel (1. c.) of his specimen from Mauritius. 



In my Note on the genus Aracostcrnus of 18S2 I suggested that Palinurellns Wieneckii 

 could be distinguished from the West-Indian form by its larger size and by the 5''' pair of legs 

 being not provided with a rudimentary hand : these differences, however, are of no importance, 

 as has already been remarked by Ort.m.w.x (1. c), because the type of P . Wieneckii is a male 

 and that of P . Guudlailii a female, but Ortmaxx, led astray by my figure, supposed the abdomen 

 to be not carinate and the s])ecies to be distinguished by this character from its West-Indian 

 congener. Gruvel's opinion that /^ Wieneckii must be considered as a variety of P. Gundlachi, 

 appears now still more probable ami I like to follow him in it, though I wish finally to remark 

 that the rostrum and the orbits of Synaxes hybridica. as figured by Spexce Bat!-; in the Report 

 on the Challenger Macrura, p. 88, 'ix'g. 11, show a quite other lorm than in my figure of 

 Palinurellus Wieneckii. 



Puerulus Orim. 



r Syn. : Palinustus .\. M.-Kdw. 18S0. 



The genus Pucrnltis Ortm. is only represented by two species, which are both confined 

 to the Indopacific. Pneriiliis angzilatits (Sp. Bate), a very young specimen of which was 

 discovered bv the "Challenorer" in the Plastern Pacific, North of Xew-Guinea, and numerous 

 adult specimens of which were taken by the "Investigator" in the Gulf of Manar and the Arabian 



