1900.] FROM SINGAPORE AND MALACCA. 761 



7th, and across the base of the 6th, I find these to be, approxi- 

 mately, for most examples : — 



Length. Breadth. 



J 4*5 mm. 2 mm. 



$ 4 mm. 2-5 mm. 



giving a ratio for the female of 1 : 1*6, for the male 1 : 2*25. 



Dim. S 7x9. 6 7-75x9-5. 6 7-25x9. tf 8-25x10-5. 

 8 7 x 8-5. 6 6-5 x 8. $ 7 x 8-5. $ 7 x 8-5. $ 7-25 x 8-75. 

 $6-75x8. $6-5x8. $6x7-25. $5-5x6-5. 

 Breadth taken across posterior margin, just above the last legs. 



LII. Genus Elamene M.-Edw. 



93. Elamene unguifornis de Haan. 



Inachus (Elamene) unguiformis, de Haan, Crust. Japon. p. 75, 

 pi. xxix. f. 1 (1839). 



Elamene unguiformis, Henderson, Trans. Linn. Soc, Zool. vol. v. 

 p. 394 C1893). 



Hah. Singapore. A female. 



Dim. 6-25x6-5. 



LIV. Grenus Pinnotheres Latr. 



94. Pinnotheres semperi Burger. 



Pinnotheres semperi, Burger, Zoolog. Jahrb. Bd. viii. p. 382, 

 pi. ix. f. 28, & pi. x. f. 27 (1895). 



Hab. Singapore ; right respiratoiy tree of Holoilmria scabra. A 

 male, and a female with ova. 



The specimens which Dr. Burger has described came from the 

 cloaca of Hoi. fusco-cinerea ; whereas the specimens we obtained 

 from that Holothurian are, 1 find, referable to P. ortmanni. The 

 host, from which came Dr. Burger's example of the latter species, 

 was, I suppose, not known, as he makes no reference to it. In 

 both these species, the animal was found high up the respiratory 

 tree, forming an enormous gall ; whether it would be able to 

 extricate itself from this, and move, at will, up or down the 

 respiratory tree, I do not know, but it has the appearance of being 

 a fixture, nolens volens. 



Dim. $10-5x11. d 7-75x8. 



95. Pinnotheres ortmanni Burger. 



Pinnotheres ortmanni, Burger, Zoolog. Jahrb. Bd. viii. p. 384, 

 pi. ix. f. 30, pi. x. f. 28 (1895). 



Hah. Singapore ; right respiratory tree of Holothuria fusco- 

 cinerea. Two females, both with ova. 



Dim. $12x3 1-5. $ 12-25 x 11 -75. 



96. Pinnotheres modiolicola Burger. 



Pinnotheres modiolicola, Burger, Zoolog. Jahrb. Bd. viii. p. 370, 

 pi. ix. f. 9, & pi. x. f. 9 (1895). 



