190^] Eohertson. — Incrusting Bnjozoa. 305 



feature of this species. In this respect it seems to be allied to 

 PorcUa rostrata Hincks ('80 and '82), an Australian form. The 

 two species differ, however, in the shape and size of the primary 

 orifice and of the ovicells. The Australian species also lacks mar- 

 ginal pores and frontal avicularia. 



Smittia coUifcm was found in considerable abundance grow- 

 ing- over a shell. It was dredged off the west coast of Coronados 

 Islands in a depth of 15 to 18 fathoms. 



74. Smittia landsborovi (Johnston) Hincks. 



PI. 23, fig. 74. 



Lepralia Landsborovii Johnston, 1847, p. 310, pi. 54, fig. 9. 



Lepralia Landsborovii, Busk, 1854, pi. 86, fig. 1. 



Lepralia reticulata, Busk, 1854, p. 66, pi. 102, fig. 1. 



Eschara Landsborovii, Alder, 1864, vol. 4, p. 105, pi. 4, figs. 1-3. 



Escharella Landsborovii, Smitt, 1873, pt. 2, p. 60, pi. 10, figs. 201, 



202. 

 Smittia Landsborovii, Hincks, 1880, p. 341, pi. 48, figs. 6-9. 

 Smittia Landsborovii, Hincks, 1888, vol. i, p. 226, pi. 14, fig. 3. 



Zoarium incrusting. Zooecia large, ovate, or rhomboidal, 

 elongate, separated by distinct lines, front wall thickly punctured 

 with large pores all over the surface (pi. 23, fig. 74) ; primary 

 orifice circular, secondary orifice with high peristome channelled 

 in front forming a sinus ; just within the sinus a broad median 

 denticle, d.; small lateral denticles probably present; in front of 

 the median denticle, a sessile avicidarium, av., with rounded man- 

 dible directed downward. Ooecia small relatively, closely united 

 with the front wall of the zooecium against which they lie sur- 

 rounded by a row of large pores; front wall punctate. 



The portion of a colony from which this description is written 

 was not in perfect condition, the orifices being filled with debris 

 so that it is not possible to be sure of the presence of the lateral 

 denticles. The broad denticle is always present. The peristome 

 is high, in older zooecia, projecting in front of the ovicell when 

 the latter is present. Spatulate avicularia said to be frequently 

 present on one side of the orifice, have not been found. 



Smittia landsborovi has ])een obtained in small quantity near 

 San Pedro, Califoi-nia. 



