120 T. GisLÉN, 



Pj, 22; -|- 5 mm. 1^' — 5"' segments thickened witli ddi'sal in-omi- 

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

 segment L = ^'2 br. The 7"' and Inliowing segments more slender, a 

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

 mm. Distal p. 13 — 14; 4,5 mm. (The first 2 and last 2 segments 

 short, the other ones L = 2 — 2^ 2 br). 



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

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

 animal otherwise white (in spii'it). 



The above-described specimen is as a young of Cr. sepientrionalis. 



Though the species-name Cr. distinda 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 distincia was given by P. H. 

 Carpenter to a species in the closely-related genus Pachylometra {C'lâ.'rk 

 did not separate this genus from Crossometra before 1918). 



Perissometra A. H. Clakk. 



P. aranea n. sp. 



Fig. 103, 104. 



From St. 7 a: 1 specimen. 



Sp. 1 (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* — 3'^ segments L shorter 

 than br, 4* one somewhat longer, 5"' L=D2 br, 0* 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 9"' 

 about cubical, antepenultimate segment L --^;4 br. Opposing spine h = ^5 

 of the br of the segment. Terminal claw curved, somewhat longer 

 than the preceding segment. 



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

 h =1/4 br, with a low median carination. I 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 flattened like 



