22 THE NAUTILUS. 



Light chestnut colored, rather opaque. Contour about that of P. 

 conspectum, the spire very low-conic, apex obtuse. Whorls 84 to 4, 

 convex, separated by impressed sutures, the last more or less descend- 

 ing in front. Umbilicus open, easily showing all the whorls, its 

 width contained 31 to 3J i" diameter of shell. Surface with close, 

 fine, irregular growth-stripe, sometimes showing slight traces of wide- 

 spaced stronger strise, and very densely, minutely spirally striated- 

 Aperture rounded-oval, quite oblique, the lip thin ; columellar mar- 

 gin brought far forward and expanded. Alt. 1'15, diarn. 2 mm. 



Numerous specimens of this small species were found by Hon. 

 Delos Arnold crawling upon a cement walk in front of his residence 

 in Pasadena, California, and were communicated to the writer by 

 Mrs. Julia E. Campbell. 



In typical P. conspectum the umbilicus is smaller, contained 4} to 

 4s times in diameter of base, and the riblets are prominent, although 

 subject to considerable variation. The dentition of the Pasadena 

 shells is similar to that of conspectum. The other species of Pnnc- 

 turn now known from America are P. pi/yinmim var. mbwctarinwm 

 Lea, and P. Randolphii Dall. 



GENERAL NOTES. 



PROPOSED BIOLOGICAL STATION. Professor T. D. A. Cockerell, 

 of Las Cruces, New Mexico, has it in view to found in New Mexico 

 a Biological Station, and health and holiday resort for scientific per- 

 sons, teachers and kindred spirits. 



Three years experience in this country gives the writer the high- 

 est opinion of the value of the climate for persons in the earlier 

 stages of phthisis ; while the abundance of new and interesting forms 

 of life, especially among the insects, is remarkable. Many inter- 

 esting general problems, such as those of the life-zones, can also be 

 studied in New Mexico to great advantage. 



A beginning will be made this summer if students can be found. 

 Prof. Cockerell will be glad to hear from any who are interested in 

 the matter, and especially from those who might be inclined to work 

 with him for longer or shorter periods during the present summer. 



PROFESSOR H. E. SARGENT is now in Deteroit, Michigan (Detroit 

 Museum of Art), engaged in preparing for public exhibition the 

 Stearns collection of Mollusca. 



