2 



University of California Publications in Zoology. [VOL. 4 



Fain iltj Cynthiidiae- 



3. Halocynthia okai n. sp._ 10-80 fath. North of Point Conception. 



4. Boltenia echinata n. sp 21-48 fath. North of Point Conception. 



5. Culeolus pyramidalis n. sp. 2259 fath. South of Point Conception. 



6. Microcosmus transversus u. sp.. 33 fath. South of Point Conception. 



7. Styela milleri n. sp. 2228 fath. South of Point Conception. 



8. Styela gibbsii Stimp.... ..... 40 fath. North of Point Conception. 



Family Ascidiidae 



Benthascidia n. gen. 



9. Benthascidia michaelseni n. sp.. 2182 fath. South of Point Conception. 



10. Ascidia clementea n. sp.... .. 654-111 fath. South of Point Conception. 



11. Ciona mollis u. sp.... 1100 fath. South of Point Conception. 



Family Distomidae 



12. Cystodites cretaceous v. Dr.... 43-111 fath. North of Point Conception. 



Fa m ily Polyclinidae 



13. Psammaplidium spauldingi n. sp. 33 fath. South of Point Conception. 



Fam ily Didemnidae 



14. Didemmun opacum n. sp. 33 fath. South of Point Conception. 



For about 50 miles to the north of Point Conception, or more 

 exactly Point Arguello, the California coast runs almost due north 

 and south, then for about 70 miles south of the Point the course is 

 nearly east and west. The broad, mountainous triangle thus stand- 

 ing out from the general northwest and southeast trend of the 

 const constitutes apparently as important a geographical barrier 

 for the littoral life of the coast as do the Tehachapi Mountains, of 

 which it is really a part, for the life of the land. 



It will be seen that ten of the fourteen species were taken 

 s;>uth of the Point. This seeming greater wealth of off-shore 

 species southward is the more striking when it is considered that 

 the stations occupied on each side of the Point were practically 

 the same, there having been 133 to the south and 130 to the 

 north. 



Some interesting results are revealed by an examination of the 

 liathymetric distribution of the species. The following table pre- 

 sents the facts : 



