92 TIIK AMERICAN MONTH LV [\\^v\\, 



Kainily : Sktikkvk i ida. 



5. Oictyocephalus microstoiua. //. s/>. Frequent. 6. Dictv- 

 ocephalus inacrostoma. //. s/>. \'cr\ fVfi|iicnt. 



Family : 'riiKotVKTiDA. 



7. Theocampe spli;uioccpliala, n. s/>. Not frtHjueiit. S. Tri- 

 colocapsa salva, R/'/sL FietiuciU. 9. Tricolocapsa tlioiacica, ;/. 

 s/*. Not fioqiieiit. 10. Tricolocapsa dowlingi, //. s/>. Not 

 frc(]uciit. II. Tricolocapsa selwviii, ;/. .^/^. Not rare. 



Family : Li rnoc amimda. 



12. Dictyomitra canadensis,;/. s/>. Not frecjuent. 13. I)ic- 

 tyomitra miilticostata. Z.ittcL Fre<|vient. 14. Dictyomitra 

 polypora, Zittcl. Frequent. 15. Stichocapsa tvirelii. n. sp. 

 Not rare. 16. Stichocapsa dawsoni, n. sp. Not frequent. 



The first species belongs to the order Sf'H.-eroida ; the second 

 and third to the order Prunoidka, and all the others to the order 



CvRTOiniA. 



1. Caryosphaera aequidistans, n. sp. — Shell composed of 

 five concentric spheres, two medullary and three cortical, each 

 with about equal radial proportions. All the spheres with regu- 

 lar, circular pores, two to four times as wide as the bars, increas- 

 ing in size from the centre towards the smooth surface. 



2. Cenellipsis hexagonalis, n. sp. — Ratio of the longer 

 axis to the shorter. 2:1. Pores regular, circular, about as wide 

 as the bars, thirteen to fifteen on the half ccjuator. The per- 

 imeter of a longitudinal section is roundish hexagonal. Surface 

 smooth. 



3. Prunulum calococcus, n. sp. — The ellipsoidal cortical 

 shell thin-walled, smooth, witii regular circular pores, about as 

 wide as the bars. Ratio of the major axis of the ellipsoid to the 

 minor, 3 : 2. Both medullary shells large and spherical, with 

 large circular pores. 



4. Cyrtocalpis crassitestata, n. sp. — Shell infundibuli- 

 form, verv thick, with regular circular pores of equal size, and 

 about as wide as the bars. Mouth large, simple, wider than the 

 length of the shell, .'surface smooth. 



5. Dictyocephalus microstoma, n. sp.— Shell thin- 

 walled, smooth, collar stricture not apparent. Ccphalis sub- 

 spherical, hyaline, without pores. Thorax inflated, subspheri- 

 cal, with regular circular pores, about as wide as the bars, in 

 twenty oblique rows. Mouth constricted, only one-third as 

 wide as the thorax, without peristome. 



6. Dictyocephalus macrostoma, n. sp. — Shell thin- 

 walled, smooth, without collai- stricture. Cephalis .sul)sph'erical, 

 hyaline, without pores. Thorax roundish, urceolated, with 

 regular circular pores, about as wide as the bars, in fifteen to 



