from the North Pacific Ocean. 445 



ranged in six regular series ; aperture round or oval. Go- 

 nangia pyrifoi-m. Length 200 milliras., breadth 100. 



Locality. White Sea and Glacial Ocean (C. Mereschkow- 

 shy). 



8. Selaginopsis mirabilis, Verrill. 



Polyserias mirabilis, Mereschk. Ann. & Mag. Nat. Hist. ser. 5, vol. i. 



(1878), p. 335, pi. XV. figs. 5, 6. 

 Selaginopsis mirabilis, Norm. Ann. & Mag. Nat. Hist. ser. 5, vol. i. 



(1878), p. 192. 



Colony plumiforra ; branches simple ; hydro thecse half pro- 

 jecting from the stem, arranged in six series j aperture with 

 two teeth. 



9. Selaginopsis cylindrica^ J. F. Clarke. 



Thvjaria cylindrica, J. F. Clarke, Scient. Results of the Expl. of Alaska, 

 vol. i. (1876), p. 22, pi. x. fig. 57. 



Colony plumiform ; branches disposed alternately, subdi- 

 viding; hydrothecse arranged in from four to six series, entirely 

 immersed in the substance of the stem. 



Locality. Alaska, Bering Sea, Chichi Islands. 



10. Selaginopsis hidentata, Allm. 



Pericladium hidentatum, AUm. Journ. Linn. Soc. vol. xii. (1876), 

 p. 273, pi. XX. figs. 1-4. 



Colony in the form of Thitjaria thuja ; branches subdividing 

 into four, and each divided into two internodes, of which only 

 the inner one (the first) bears oval gonangia ; hydrothecee in 

 eight to ten (?) series, not entirely immersed; aperture with two 

 teeth. 



Locality. Japan. 



11. Selaginopsis Allmam, Norm. 



Selaginopsis fusca, Allm. /. c. p. 272, pi. xii. fig. 1, and pi. xix. figs. 1, 2. 

 Selaginopsis Allmaiii, Norm. Ann. & Mag. Nat. Hist. ser. 5, vol. i. 

 (1878), p. 192. 



Branches arranged on two sides of the stem, subdividing ; 

 hydrothecffi not entirely immersed, cylindrical, with the margin 

 slightly waved, arranged in four rows (in pairs) ; colour very 

 dark. 



Locality. Japan. 



12. Selaginopsis fusca, Johnston. 



Sertularia fusca, Johnst. 

 Selaginopsis fusca. Norm. I. c. p. 191. 



Colony plumiform ; hydrothecse arranged in four series, in 

 twos on each side of the very compressed branch. 

 Locality. England. 



