120 T. GiSLEN, 



Pji 22; + -^ "UTi- 1^' — '">"' segments thickened with dorsal promi- 

 nences similar to those in tlie fam. Galometridce (cf. the figure). P' 

 segment L = V2 br. The 7"' and following segments more slender, a 

 little flattened. Distal segments: L ^ br. Pj +18; 4 mm., Pj 14; 8,2 

 mm. Distal p. 18 — 14; 4,5 mm. (The first 2 and last 2 segments 

 short, the other ones L = 2 — 2' 2 bi|. 



Disk very closely and coarsely granulated, »lean». somewhat 

 incised, diam. 4 mm., not completely regenerated, dark-brown. The 

 animal otherwise white (in spirit). 



The above-described specimen is as a young of Gr. septentrionalis. 



Though the species-name Gr. diHtiticta is older still, in conformity 

 with A. H. Clark, I do not wish to use it, partly because it is a no- 

 men nudum, partly because the name distincta was given by P. H. 

 Carpenter to a species in the closely-related genus Pachylometra (Clark 

 did not separate this genus from Grossometra before 1018). 



Perissometra A. II. {'l.\i(ic. 

 P. aranea n. sp. 



Fig. 10:5, 104. 

 From St. 7 a: I specimen. 



Sp. I (St. 7 a) Cd a low cone, br 2 mm. Dorsally with a cen- 

 tral cavity and small side-cavities. C. XIV 17 — 21; 10 — 11 mm. in a 

 single or double whorl and in 10 rows. P'-8'' segments L shorter 

 than br. 4"' one somewhat longer, S"" L=l' 2 br, 6'*' one L 2 bi-, 

 distally a little widened, with an inconspicuous dorsal spine. Then 

 shorter segments with a dorsal spine. The cirrals from about the '.•''' 

 about cubical, antepenultimate segment L '^ 4 br. Opposing spine h ' .-. 

 of the br of the segment. Terminal ehiw curved, somewhat longei- 

 than the preceding segment. 



R — s narrow bands, almost coneealeii. I Br-s 1 contiguous, 

 h=^/4 br, with a low median carination. 1 Brax pentagonal, h = */3 br, 

 with a similar, low longitudinal tubercle; a slight thickening of the 

 distal border, the rest of the ossicle smooth; laterally ilattened like 



