Solenogaster Mollusks — Schwabl 
269 
provided with two small denticles; the cuticle 
of the tongue is thin but highly chitinous. The 
cuticular ridge on the dorsal wall of the mid- 
gut is near the opening of the liver, and a 
rectum is present. Granular cells occur on the 
dorsal wall of the liver and on the edges of 
the septa which divide the liver into numerous 
lobules. The pericardium is spacious; the heart 
is typical and has two atrioventricular openings. 
The gonoducts open on papillae; their epi- 
thelium is not continued on the wall of the 
cloacal chamber. 
DISTRIBUTION : This has been found only 
once, in the San Pedro area of southern Cali- 
fornia, in 265 fm, on gray green mud. 
Crystallophrisson scabrum Heath, 1911 
Heath, 1911, pp. 44, 63, pi. 4, figs. 2, 16, pi. 
29, figs. 6, 7, 9-11, pi. 30, figs. 1, 3, pi. 37, 
%• 19. 
COLLECTIONS: 
2189 (12) in 228 fm, with Limifossor fratula 
and C. hartmani. 
2306 (1) in 215 fm, with Limifossor fratula. 
2357 (1) in 100 fm. 
2418 (13) in 185 fm, with Limifossor fratula 
and C. nitidulum pacifca. 
2749 ( 1 ) in 277 fm, with Limifossor fratula. 
2793 (2) in 251 fm, with C. sp. 
DIAGNOSIS: This is a rather small species, 
10-12 mm in length, and 2 mm in greatest 
diameter. The region of the liver is greenish, 
and the hind end has brown incrustations. The 
prothorax is short and swollen, and the second 
half of the body is considerably thickened. The 
mouth opening is rather large and surrounded 
by the round buccal plate. Compact groups of 
gland cells occur mainly on the dorsal side of 
the fore-gut. The pericardium is large and the 
heart highly muscular. The cloacal chamber is 
small. 
DISTRIBUTION: This species was originally 
described from Monterey Bay in 715 fm 
(Heath, 1911); the present records are from 
the San Pedro area, including Redondo can- 
yon, in depths of 100-277 fm, in m.ud. 
Crystallophrisson hartmani Schwabl, 1961 
Figs. 11, 12 
Schwabl, 1961a, pp. 258-277, figs. 1-10. 
COLLECTIONS: 
2150 (3) in 310 fm, with C. rubrum and C. 
riedli. 
2189 (1) in 228 fm, with C. scabrum and 
Limifossor fratula. 
2218 (1) in 249 fm, with Limifossor fratula. 
2220 (1) in 180 fm, with Limifossor fratula 
and C. nanulum. 
2223 (1) in 480 fm, with C. sp. 
2230 (2) in 300 fm, with Limifossor fratula 
and Prochaeto derma calif ornicum. 
2299 (1) in 360 fm. 
2301 (1) in 335 fm. 
2302 (1) in 185 fm, with C. sp. (used for 
Fig. 12, left). 
2321 ( 1) in 385 fm, with Prochaetoderma 
calif ornicum and C. sp. 
2361 (1) in 167 fm, with Limifossor fratula, 
C. nanulum and C. sp. 
FIG. 11 . Crystallophrisson hartmani. Characteristic 
spicules from body regions a , b, c, d. 
