16 bartsch: Philippine land mollusks 



locus coeruleus. Degenerated fibers were fairly abundant in 

 the mesencephalic root as far cephalad as the point of crossing 

 of the IV-nerve root. A few of these sensory fibers apparently 

 continue farther cephalad in the mesencephalic root to end in 

 the V-mesencephalic root nucleus lateral to the central gray 

 mass above the IV and III nuclei. Additional experiments are 

 in progress to determine the distribution of the nerve fibers 

 arising from the V-mesencephalic nucleus and the locus coeruleus. 



CONCHOLOGY. — The land mollusks of the genus Ohba from the 

 islands of Bohol and Panglao, P. I.^ Paul Bartsch, U. S. 

 National Museum. 



The United States National Museum has recently received a 

 lot of shells belonging to the genus Ohba, collected by Gilbert 

 S. Perez on the islands of Bohol and Panglao, which made a 

 revision of the group necessary. This has resulted in the rec- 

 ognition of a number of new forms, brief critical diagnosis of 

 which are presented herewith. A fuller account and figures of 

 these will be published in a monograph on the Philippine mem- 

 bers of the genus, which is in preparation. 



Obba rota Perezi, n. subsp. 



The present race differs from Obba rota rota Broderip, which is at 

 home on the island of Siquijor, in being decidedly more elevated and 

 in having the peripheral keel less upturned at the edge, and situated 

 about half way between the base and summit, while in Obba rota rota 

 it is at the anterior extremity of the upper third. 



The type. Cat. No. 216983, U. S. N. M., comes from Bilar, Bohol, 

 and measures: altitude, 10.2 mm.; greater diameter, 27.6 mm.; lesser 

 diameter, 22 m. 



Obba rota panglaoensis, n. subsp. 



This race is much smaller and darker than Obba rota rota Broderip. 

 It is elevated like Obba rota -perezi B. and has the keel similarly situated, 

 but the sculpture is rougher in the present race. 



The type, Cat. No. 216984, U. S. N. M., comes from 'Panglao 

 Panglao Island, and measures: altitude, 9.7 mm.; greater diameter, 

 23.5 mm.; lesser diameter, 18.7 mm. 



1 Published by permission of the Secretary of the Smithsonian Institution. 



