L909] Tm n ii : Tin Leptomedusat of the San Diego Region. 19 



I believe these clearly marked groups should be distinguished 

 provisionally as genera. The first will (lien retain the name of 



il rigina] genus. For the second, the name Tiaropsidium is 



proposed, T. kelseyi to be its type. 



Tiaropsidium kelseyi, 1 n. sp. 

 Fig. 5. 

 Umbrella moderate, about three times as broad as high. Ma- 

 nubrium small, short, with thin walls and slightly frilled lips. 

 Pour large perradial and 4 similar interradial tentacles with 



Hum ielseyi. Slightly enlarged. 



bulbous bases. Between each adradial sense-organ and the ad 

 joining large tentacle on either side, 3-5 small tentacles. Gonads 

 narrow, much folded in larger specimens, along entire length of 

 radial canals. Umbrella colorless, transparent; manubrium, ca- 

 nals, gonads and tentacles a faint yellow. 



Diameter 50 mm. in larger adults. 



Distribution. — Single individual obtained in vertical haul 

 from 200 fathoms. July 12, 1005, off San Diego. Ace. No. 1005, 

 30 mm. diam. A much damaged individual 45 mm. diam. ob- 

 tained June 19, 1908. in trawl, from 50-100 fathoms. Many indi- 

 viduals, most of them badly damaged, obtained in numerous deep 

 dredge hauls between San Diego and Monterey. California, by 

 U. S. S. Albatross in 1904. The largest of these specimens are 



i Named for Mr. F. W. Kelsey of San Diego, Secretary of the Marine 

 Biological Association. 



