mportant details, I consider it as .1 variet) of the last described 



apitulum wi : li.it the occludent segmeni ol the scutum of this 



,!,,,„ t> ■ the basal segment, and thal il does n<.i grow wider 



i.ui has about the satne width throughout its length. I h<- tergum of this 



furrowed like the same valves in D. Versluysi, does not show the 



just above the apex of th<- carina. The carina itself not only lias almost 



ral shape, biil its basal portion ha il\ the particular form which is so 



• 



resents this form and this specimen, the length of the capitulum 



mm., has been dissected to prepare the valves and to make out its identity: 



t this form no longer exists and this alone would 1"- a reason for not 



it into science as ,1 new species. As, further, its relation to />. Versluysi is ver) 



1 think it right t<> indicate it as D. Versluysi Var. The single specimen was taken at: 



258. 1 'cc. 12— ï". [899. Tual anchorage, Kei Islands. Depth 22 111. Bottom: Lithotham- 

 nion, sand and coral. 



Genus Megalasma Hoek 

 HOEK, Cirripedia of the "Challenger", 1883, p. 50. 



This genus was founded (1883) for a very characteristic Cirriped dredged during the 

 cruise of the "Challenger". It belongs to the same natural group of genera as Poecilasma, 

 Dichelaspis and Lepas and is nearly related to the first of these tliree. 



In [894 W11 i\i.k' described a second species of this genus and gave it the name of 

 M. carino-dentatum. A third was collected by Il.M.S. "Siboga" in 1899. 



The diagnosis given for this genus in the "Challenger" Report holds good for the forms 



•vered later, with one exception; the triangular form of the scutum which was so very 



striking in M. striatum is, strictly speaking, gone in -JA lineatum (and so far as can be judged 



from the sketches of Weltner, the same is the case in M. carino-dentatum), there being a 



distinct though short basal margin. Hence, I propose to have the diagnosis changed so far that 



ta are not called triangular but approaching more or less to a triangular form. 



For the determination of the species known at present, the following table may be of use: 



Megalasma 



.1. Dorsal margin of the carina developed into a broad flattened part 

 forming the continuation of the downwards inclined portions of the 



mg their carina! margin IA striatum. 



margin of the carina not forming a broad flattened part. 



margin of the carina having a tooth-like excrescence. . .IA carino-dentatum. 

 al margin of the carina without a tooth-like excrescence. . M. lineatum. 



m Indischen Ocean. Sit/. Ber. <', L -~. Naturf. Freunde zu Berlin, 1S94, p. So. 

 3° 



