MAZATLAN BBYOZOA 3 
Genus LEPRALIA, Johnston. 
Lepralia, B. M. Cat. p. 63. 
3. Lepratia Aatrorusca, Rylands, ms. (n. s.) 
Cellulis elongatis, ovatis seu rhomboideis, lined tenui elevaté 
cinctis, superficie punctato ; ore suborbiculari, inferne sinuato, 
utrinque denticulato. 
General hue, blackish ; and even when the cells are more 
calcareous and on that account whiter, the dark interstitial 
line remains very evident. It is quite distinct from L. cucullata, 
(B. M. Cat. p. 81, pl. 96, fig. 4, 5,) also of a black colour, and. 
which occurs in the Mediterranean. 
Hab.—Mazatlan ; on Imperator olivaceus and" unguis, and on 
Anomia; L’pool Col. 
Tablet 4 contains 2 groups detached. 
4. LEPRALIA TRISPINOSA, Johnst. 
B. M. Cat. p. 70, pl. 85; fig. 1, 2; pl. 98; pl. 102. fig. 2.— 
Johns. Br. Zooph. i. 324, ed. 2; pl. 57, f.7.—Couch Corn. 
Faun. iii. 118.—J. Macgillivray in Ann. § Mag. N. fist. 1x. 
467. 
Discopora trispinosa, Johns. in Hd. Phil. Journ. xiii. 322. 
Berenicea trispinosa, Johns. in Trans. Newe. Soc. 11. 268. 
A single minute specimen only has occurred to my notice, . 
_but this is quite indistinguishable from the British form. 
Hab.—On shells from deep water, rare, Berwick Bay, Johnston. 
Coast of Cornwall, Peach.—On root of Laminaria digitata, 
near Aberdeen, Macgillivray.—Mazatlan ; on Imperator ; 
LT’ pool Col. 
Tablet 5 contains the group. 
5. Lepratia Mazatnanica, Busk. (n. s.) 
Cellulis tmmersis, depressis, seu ventricoso-globosis ; swperficie 
punctato ; ore suborbiculari inferne late sinuato ; margine incras- 
sato, elevato ; aviculario unico (vel rare, duobus) laterali prope os. 
This form might easily be confounded with some varieties of 
L. unicornis, or L. Ballii. It is distinguished, however, by its 
reddish colour, and the elevation of the mouth together with 
its thickened margin. The single or sometimes double avicu- 
larium points outwards and upwards, and the mandible is pro- 
longed and acute. It is sometimes, but not frequently absent. 
Hab.—Mazatlan ; on Imp. olivaceus and unguis; L’pool Col. 
Tablet 6 contains a group on Imperator.—7, one detached. 
