THE SESSILE BARNACLES. 



311 



Cirrus ii has slightly unequal ranii of 7 and f> .segments. The 

 spines of the terminal segments are as described and figured for 

 (\ x/ct/t'ttis. There are no large-toothed spines, as in C. challcngcri. 



Cirrus vi has 16 segments, bearing four pairs of spines, as in the 

 specimens from Ayukawa drawn in figure 87e. 



I had thought this a race of C. stellatus or C. chattengcri 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 even, fine, comblike pectination of the 

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



FIG. 90. OHTHAMALCS MALAYENSIS. a, MAXILLA, AND &, MANDIBLE. 



of Chthamalus 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. 

 Plato 72, figs. 6, 6, Gb. 



Type. Cat. No. 48197, U.S.N.M., from Zamboanga, Mindanao, on 

 Tcfraclita squamosa, collected by Dr. E. A. Mearns. 



The barnacle is strongly ribbed, whitish, conic; radii narrow, the 

 ala3 rather wide; sutures distinct, simple. 



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

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

 ing beyond the tergal border of the valve. Adductor muscle pit not 



