TROCHUS. Panama Shells. 191 



Trochus (Monodonta) catenulatus Menke in Zeitschr. f. Malak. vol. 



for 1850. p. 173. Apr. 1851. 



This species belongs to the subgenus MODULUS. Its Carib- 

 bean analogue is T. angulatiis Ad. 



Station. Unknown. 



Habitat. Mazatlan ; Melchers ! Menke. 



Taboga ; C. B. A. ! 



23 specimens were collected in various states of preserva- 

 tion. 



274. Trochus coronulatiis. Nov. sp. 



Shell conic, moderately elevated, thick: dingy white, with 

 broad reddish brown oblique flammules, with the nodules pale 

 red : with minutely undulated spiral raised lines : anteriorlj- 

 with four or five larger raised lines : with, on the periphery of 

 the last whorl, two spiral nodulous keels, of which one appears 

 on the spire : with a series of larger nodules on the shouldered 

 margin of the whorls : spire with the outlines moderately curvi- 

 linear : apex subacute : whorls six, planulate above the keels, 

 with the suture broadly and deeply canaliculate : aperture 

 nearly orbicular : labrum much advanced in the upper part : 

 columella bidentate : umbilicus one third as wide as the aper- 

 ture, reaching to the apex. 



Mean divergence about 90 ; length .55 inch ; greatest breadth 

 .72 inch ; least breadth .6 inch. 



/Station. Unknown. 



Habitat. Taboga; C. B. A. ! 

 "We found 2 specimens. 



275. Trochti Leanus. Nov. sp. 



Shell conic, well elevated : pale yellowish or reddish brown, 

 with broad dark brown oblique flammules ; anteriorly some- 

 what articulated with red and yellowish white in fine con- 



