310 BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



The scutum has a very prominent articular ridge and a narrow 

 adductor. The tergum has a carinal margin higher than in Chal- 

 lenge n (fig. 88). 



The mandible and maxilla do not differ materially from those of 

 C. challenyeri (fig. S9#,, &). 



Cirrus i has rami of 8 and 7 segments, the anterior rainus longer 

 by two and one-half segments. 



Cirrus ii has rami of 6 and 5 segments, the anterior ramus longer 

 by two segments. 



Both rami have several serrate spines in the terminal tufts, but 

 these spines have not the large lower teeth seen in C. challcngeri. 



Cirrus iii has equal rami of 14 or 15 segments. 



Cirrus \\ has three pairs of spines, as in C. challenge ri (fig. 89c). 



The first and second cirri are black pigmented ; also the first joint 

 of the pedicel in the other cirri, the amount of pigment decreasing 

 backward. 



CHTHAMALUS MALAYENSIS, new species. 

 Plate 72, figs. 5, ^a. 



Type. Cat. No. 48084, U.S.N.M., from the Malay Peninsula, col- 

 lected by E. Deschamps. 



The barnacle is depressed, strongly ribbed, more or less corroded, 

 and brownish gray externally. The interior is punctate in old indi- 

 viduals ; border, pale, within which there is a dull purple band ; the 

 remainder flesh tinted. Sheath is extremely short. 



The opercular valves are deeply corroded externally, nearly white 

 within, punctate. The articular ridge of the scutum is very promi- 

 nent in the middle, tapering both above and below. Adductor pit 

 rather deep, and there is a very small rudiment of an adductor ridge. 



The tergum is triangular, very narroAV at the lower end. Articular 

 ridge broadly reflexed. Scutal border broadly inflexed. Basal border 

 nearly straight. 



The mandible has four teeth, as usual, the third and fourth being 

 bifid. The lower extremity is trifid, having three large, stout, equal 

 spines. Between the fourth tooth and the lower spines there are 

 about six subequal small spines, but very much larger than those of 

 C.stellatus or C. cJiaUengerl (fig. 90&). 



The maxilla has a more irregular edge than C. chcMengeri, but 

 is similar in arrangement of spines. There are three large spines 

 above, as in the Japanese species (fig. 90;). The palpi are like those 

 of C.stellatus. 



The first cirrus has rami of 8 and 6 segments, the posterior ramus 

 about four-fifths as long as the anterior. 



