THE SESSILE BARNACLES. 



311 



Cirrus ii has sliohtly uncMiUiil ranii of 7 and segments. The 

 spines of the terminal segments are as described and figured for 

 ('. sfcllatus. There are no hirge-toothed spines, as in C. challenfjeri 



Cirrus vi has 10 segments, bearing four pairs of spines, as in the 

 specimens from A3advawa drawn in figure 87e. 



I had thought this a race of C. steJlatu^ or C. chaJlengcH until I 

 examined the mouth parts. The mandible is so different, however, 

 that in the present state of our knowledge I think it best to rank it 

 as a species. In place of the CA'en, fine, comblike pectination of the 

 space below the fourth tooth of the mandible, which many species 





Fig. 00. — Chthamalus malayensis. a, maxilla, and b, manuible. 



of ChtJuinudus have, there is a series of coarse teeth. The equality 

 of the three spines at the lower angle of the mandible is a less im- 

 portant difference. The mouth parts of this species and C. chal- 

 lengeri are drawn to the same scale. 



The status of this form depends upon the constancy of the features 

 of the mandible, which can be determined only by the examination 

 of a larger series of specimens. 



CHTHAMALUS MORO, new species. 

 Plate 72, figs. G, Qa, <6h. 



Type. — Cat. No. 4S197, TLS.N.M., from Zamboanga, Mindanao, on 

 Tetradita squanwsa^ collected by Dr. PI A. ISIearns. 



The barnacle is strongly j-ibbed, whitish, conic; radii narrow, the 

 alic rather wide; sutures distinct, simple. 



The tergal margin of the scutum is nearly eciual to the basal; 

 articular ridge straight, long, obliquely truncate below, not project- 

 ing beyond the tergal border of the valve. Adductor muscle ])it not 



