^%3y''] PROCEEDINGS OF THE NATIONAL MUSEUM. 453 



cies of the geuUvS Gavolinia, nnvhudu occuiTed at two of the dredgiug* 

 stations 2750, 27(!(), and atone of the sui-face stations, surface 1(J. The 

 species longirontri.s was found at two dred,i;in};- stations 2754, 27G0, and 

 two surface stations 2G, P>1 ; tridentata Avas taken at four of the dredg- 

 ing stations 2750, 275G, 2700, 270.",, but at ]ione of the surface collec- 

 tions; gibhosa occurred at two of the dredging stations 27.50, 2700, and 

 at one surface station, 19; trispinosa was found at four of the dredging 

 stations, 2750, 2751, 2754, 2700, and at one surface station, 2; infle.ra 

 wastaken at two dredging stations 2754, 2700; qiiadrldentata ocxmrred 

 once only, as a deposit shell at 2700. 



Of the species of Clio represented in the collectionsfroni these points, 

 Clio (Crcsels) rlrt/ula has been included in the study, although it was 

 taken at a point farther north in the Gulf Stream (hereafter described). 

 Clio (Cresels) eon lea was taken at surface station ] ; Clio {HyalocyUx) 

 sfWrt/rt was taken at surface station 10; Clio [Styliola) Kuhnlata was 

 taken at surface station 1, also at dredging station 2754; Clio {s. str.) 

 balantium wastaken at dredging station 2754; Clio (s. str.) 2)yraniid- 

 ata was taken at dredging stations 2750, 2751, 2700. 



Lastly, of the genus 0?uvVm?/f, the S])ecies co/»»<e//fl was taken at 

 two dredging stations 2754, 2700, and at surface station 2. 



Of the data of the distribution of these families here given, results 

 indicate that areas of deposit and the sui-face habitat of these inollusks 

 in these particular temperate and tropical regions, are rich in Cavolin- 

 iidw, especially so in Cavolinia, while Clio and Cuvierina are very well 

 represented; Clio occupying the more noi-thern latitudes in so far as 

 these collections give evidence. Results also show that there are no 

 marked distinctions between the kinds and distribution in the Atlan- 

 tic and the Pacific waters upon either side of northern South Ameri- 

 ica. The shells in deposit (;ontirm tlie evidence of the surface collec- 

 tions, so far as there is any evidence from deposits npon the floor of the 

 ocean. As lias been said, there is no material dredged from the Pacific 

 side, where surface collections were present, but these latter, from the 

 Pacitic, were entirely similar to the relative kind and abundance of 

 tlie pteroi)ods, l)oth surface nuiterial and deposit shells, of the Atlantic 

 side. The few Limacinida'. taken, either as dead shells or in the low 

 temperatures of bathybic collections, were obtained from the deep-water 

 dredgings in the Atlantic. 



I have given in Plate i an outline map of the region to which this 

 account applies, reference to which will show the line of transit along 

 which the stations are laid. 



Some of the dredging stations are apparently near in-sliore for the 

 occurrence of pteropod deposits, but all are drawn in at least 500 

 fathoms. 



After leaving station 2703, the course of the steamer lay south for 

 20 degrees of latitude in the shallow waters along the eastern coast of * 

 South America, the depth ranging only from 10 to about 80 fathoms. 



