1893.] MTOROSCOIMCAL JOURNAL. 93 



sixteen oblitjiie rows. Mouth less constricteil than in tlie former 

 species ; two-thirds as wide as the thorax, without ])eristome. 



7. Theocampe sphaerocephala, n. sp. — Siiell wide, bottle 

 shaped, thin-walled, with two distinct strictures. Cephalis 

 spherical, hvaline, without pores. Thorax cainpanulate, with 

 three transverse rows of circular pores. Abdomen inflated with 

 from eight to nine ohlitjuely descendini^ rows of circular pores. 

 Mouth but little constricted, two-thirds as wide as the abdomen. 

 Ratio of the three joints to each other: len<^th. 1:2:4; ^"'^"Klth 

 1:3:6. 



8. Tricolocapsa salva, Rust. --.'^hell slenderly ovate, with 

 two sliy;ht strictures. Thorax of al)out the same size as the 

 abdomen. Relative lengths of the three joints, i i^.!^:^; rela- 

 tive breadth, 1:3: 3o- Cephalis flat, hemispherical, hvaline, 

 without pores. Thorax spherical, with subregular, circular, 

 unecjual pores. Abdomen broad, ovate, with larger, regular, 

 circular pores, in from nine to ten transverse rows. Surface 

 smooth. 



g. Tricolocapsa thoracica, n. sp. — Shell ovate, smooth, 

 with two distinct strictures. Relative lengths of the three joints, 

 2:5:3, relative breadths 3:5:5. Cephalis, hemispherical, with 

 from three to four transverse rows of small circular pores. Tho- 

 rax subspherical, with from nine to ten transverse rows of larger, 

 regular, circular pores. Abdomen broad, hemispherical, with 

 from four to five transverse lows of pores of the same size. 



10. Tricolocapsa dowlingi, n, sp, — Shell ovate, smooth, 

 with upper slight, and lower deep stricture. Relative lengths of 

 the three joints, 1:4:6; relative breadths. 1:3:5. Cephalis, 

 hemispherical, hyaline, without pores. Thorax quite spherical, 

 with from seven to eight oblique rows of large circular pores, 

 twice as wide as the bars. Abdomen subspherical, compressed, 

 with from ten to twelve transverse rows of distant, smaller circular 

 pores. 



11. Tricolocapsa selwyni, n. sp. — Shell wide, bottle- 

 shaped, smooth, with two distinct strictures. Relative lengths 

 of the three joints, i : 2 :4 ; relative breadths, i : 2.5 : 6. Ceph- 

 alis small, ovate, hyaline, without pores. Thorax hemisphercial, 

 with four transverse rows of circular regular pores. Abdomen 

 large, inflated, spherical, wdth from ten to twelve transverse rows 

 of pores of ef[ual size. 



12. Dictyomitra canadensis, n. sp.— vShell short, conical, 

 campanulate. smooth, with three distinct strictures. Cephalis 

 small, spherical. Thorax small, hemispherical, with three trans- 

 verse rows of circular pores. Abdoinen with two joints ; the 

 upper large, inflated, with eleven transverse rows of circular, 

 regular Dores row the lower joint ring-shaped, with four transvers 

 rows of pores of the same size. The wide, open mouth without 

 peristome. Relative joints of the four joints, 1:1:5:2; relative 

 breailths, i ; i :5 : 5 : 5-5. 



