Barnacles of the Genus Megalasma. 367 



tubercle on each valve. Tergum with apex slightly re- 

 curved; occludent margin convex in its upper half ; angle of 

 occlndent and scutal margins slightly produced; a well- 

 marked groove from apex to scuto-carinal angle. Carina 

 with sides expanding evenly from above downwards, so that , 

 the inner margin is regularly concave ; basal margin ex- 

 tending well below base of scutum and at right angles with 

 it ; septum with concave margin, its lateral angles prominent 

 in side-view. 



Peduncle about one-third of capitular length, coarsely 

 corrugated, with obscure carinal keel. Attachment almost ;it 

 the margins of scuta and carina. 



A single pair of rather short, slender, filamentary ap- 

 pendages on dorsum of prosoma near its posterior margin. 

 Rami of first cirrus with 9 and 10 segments respectively. 

 Caudal appendages less than one-fourth as long as peduncle 

 of sixth cirri. 



Measurements. — Length of capitulum 25 mm., breadth 

 13 nun. ; length of peduncle 8 nun. 



Remarks. — In some respects this species seems to approach 

 M. annandalei, Pilsbry, from the North Atlantic. It differs 

 in having no sudden widening of the sides of the carina and 

 no excavation of the adjacent margin of the scutum, us well 

 as in the thick cuticle covering the valves and many other 

 details which forbid its identitication with that species. 



Megalasma (Glyptelasma) orientate, sp. n. 

 ( Text-figs. 3 and 4.) 



Localities.-^-hnt. 9° 15' S., long. 115° 10' E., 800-1500 

 fath. 5 specimens (-including holotye). 



Lat. 11° 0' S., long. 122° 0' E., (300 rath. 1 specimen. 



Specimens taken by C./S. ' Patrol ' from Java— Australia 

 cables. 



Description. — Valves of shell resembling those of M. sub- 

 carinatum, Pilsbry. Scutum with occludent margin convex, 

 carinal margin convex above, deeply excavated below, basal 

 margin everted, forming about a right angle with the chord 

 of the occludent margin. Submarginal ridge from umbo to 

 apex very close to the actual occludent margin, which is 

 concealed when capitulum is viewed from the side. On the 

 inner surface the "smooth basal area''-' has its upp.:r edge 

 (which marks the line of attachment of the peduncle) much 

 less arched than in At. subcarinatatn, Tergum with carinal 

 margin inclined towards the occludent, apex acute. Carina 



