12 LITTORINID.E. 



Lyons (Martin) ; Nice (Verany) ; Spezzia (J. Gr. J.) ; 

 Canaries (M f Andrew in mus. Brit.). 



This is a very doubtful species ; and concholo gists 

 must exercise their own discretion as to admitting it. My 

 impression is that it constitutes only a variety of R. reti- 

 culata. The authors of the ' British Mollusca' say that 

 the two " may usually be distinguished with readiness by 

 the smaller size of their latticework. Every degree of 

 reticulation, from coarse to fine, may be seen by com- 

 paring a sufficient number of specimens. 



5. R. reticulata *, Montagu. 



Turbo reticulatus, Mont, Test. Br. p. 322, t. 21. f. 1. B. Beanii, F. & H. 

 iii. p. 84, pi. lxxix. f. 5, 6. 



Body yellowish-white : mantle furnished with a single fila- 

 mental process : snout " near its termination at the upper sur- 

 face appears to have attached to it two very small similar 

 shields, one on each side, independent of the terminal minute 

 subcircular flat lobes : " tentacles compressed, slender, rather 

 long, " not setose " [?] : eyes on short light-yellow or orange 

 pedicles: foot " subrotund, scarcely auricled, but grooved in 

 front sufficiently to form a shallow labium, slightly constricted 

 anteriorly at one- third the length, gently tapering to a rather 

 obtuse lanceolate but not emarginate termination : " opercular 

 lobe plain, moderately expanded : appendage consisting of three 

 blunt, cylindrical, short cirri : gill composed of 12-15 single, 

 pale-yellow, short strands, which are visible when the neck is 

 much protruded. (Clark.) 



Shell oblong, solid, nearly opaque, more or less glossy : 

 sculpture, numerous somewhat obscure and slightly curved lon- 

 gitudinal ribs, seldom extending to the base, and crossed by 

 equally numerous but much more distinct and thread-like spiral 

 ribs, which cover the surface of the last 4 whorls ; the points 

 of intersection are sometimes nodulous, but rarely on the lower 

 part of the body-whorl ; there are 6 or 7 rows of spiral striae 

 on the penultimate whorl ; labial rib thick and traversed by 

 the spiral striae, occasionally forming a separate varix ; top 

 whorls smooth and glossy, showing under the microscope faint 



* Reticulated. 



