ACADEMY OF NATURAL SCIENCES. 243 



Mr. W. H. Dall was elected a Resident Member, December 4th, 

 1865. 



Regular Meeting, March 5th, 1866. 



President in the chair. 



Eleven members present. 



Donations to the Library : Soci^te* de G£ographie de Geneve ; 

 Memoires et Bulletin, Tomes I— III ; From F. Berton. 

 The following papers were presented. 



Note on Octopus punctatus, Gabb. 



BY W. H. DALL, ACTING DIRECTOR SCI. CORPS W. U. T. EX. 



A half-decayed specimen of this species, (described by Mr. Gabb, in Proc. 

 Cal. Acad., Ap. 7th, 1862) discovered in some alcoholic miscellanea, recently, 

 afforded the following observations. 



The buccal plates or mandibles, resemble those of O. luberculatus, Blainv. 

 [Woodw. Alan. PI. I. Fig. 2] but are more produced longitudinally. They 

 are black and verv brittle. 



(Fig. 27.) 



Dental formula, 3-3-3 (Fig. 27, A), or f^i' 2 ' 1 ' 



Rhachis armed with one central quinquedentate tooth, and two lateral, simple, 

 denticles ; the insertion of all is broadly arcuate. The pleura are provided each 

 with two simple recurved uncini and one rhomboidal plate with a small recurved 

 hook. The central rhachidian tooth is occasionally irregular. (Fig. 27. L, X). 

 When immature, the dental laminae are without color, more slender, compressed, 

 and the dentations are less distinct. (Fig. 27 r L.) Immature rows, about 15, 

 perfect 60, worn and broken 25, total 100. Mag. 100 diameters. Length of 

 specimen 3 feet. Locality, near San Francisco. From the market. 



Professor Whitney communicated the following abstract of the 

 results obtained by M. Remond in his geological explorations of 

 Northern Mexico, made in 1863 to 1865, and drawn up from his 



