180 CHLOROSTOMA. 



This species is allied to C. coroniilatuni. Tlie large size, somber 

 color and strong beaded spiral ribs at once characterize it. 



C. RUBROFLAMMULATUM Koch. PI. 29, figs. 57, 61, 62. 



This form is similar in general appearance and form to C. qnadri- 

 costatum. The spire is either elevated or rather depressed ; the 

 sutures deeply canaliculate; the last whorl encircled by three prom- 

 inent, equidistant carinje, one subsutural, composed of rounded or 

 radiating knobs followed by two or three beaded lirulre, two at the 

 periphery, prominently beaded, with a beaded riblet between them ; 

 base encircled by 5 more or less beaded, equal lira3 ; the entire 

 surface microscopically obliquely striate, and in some places decus- 

 sated by microscopic spiral stride. Aperture oblique, rounded-quad- 

 rate ; outer lip thick, Urate within ; columella less deeply sinuous 

 than in C. quadricostatum, arcuate, tridentate below; umbilicus 

 narrower than that of C. quadricostatum. Color whitish, radiately 

 striped above with pink, the ribs of the base dotted or articulated 

 with pink. Alt. 15, diam. 18 ; alt. 22, diam. 21 mill. 



Panama ; Gulf of California. 



Trochns ruhrofiammulatus Koch, in Philippi, Ahhild., i, Trochus 

 t. 2, f. 4.— ConchyL Cab., p. 186, t. 28, f. 17.— Fischer, Coq. Viv., 

 p. 250, t. 85, f. 1. 



The light coloration, complete coalescence of the two subsutural 

 ribs into one series of tubercles, the equal lirse of the base and the 

 lirate interior of the aperture at once separate this form from C. 

 quadricostatum. 



C. MELALEUCAS Jonas. PL 63, figs. 1, 2. 



Shell rather solid, conical, apex obtuse, profoundly umbilicated, 

 white ornamented with oblique black flaramules ; whorls 6, with a 

 coronal series of tubercles, carinated, the carina nodulose; chan- 

 nelled below the carina, and spirally bistriate ; last whorl bicari- 

 nate ; base concentrically sulcate ; aperture subrhomboid, fauces 

 smooth; columella arcuate; terminating in two teeth. (Phil.) 



This species, closely allied to T. quadricostatus Wood and T. 

 Tubrofliminulatus Koch, is readily recognized by its very peculiar 

 characters. It consists of 6 whorls, which are divided by a nodose 

 keel into a larger convex upper portion and a smaller channelled 

 lower part ; a second series of blunt tubercles adorns the upper edge 

 of the whorls along the suture ; below there are slightly elevated 

 striie; the last whorl has the base sharply separated by a second 



