STAUROCALYPÏUS DOWLINGI. 173 



According tu the descriptions of L. M. Lambe and F. E. 

 Schulze, the species should show a tolerably thick-walled broadly 

 sacciform body, somewhat outbulged on one side and Jiarruwed at 

 base. It mav attain a lariie size, as attested l)v a fraoment of the 

 wall 300 mm. long and lö mm. thick, obtained by the "Albatross " 

 on the Californian coast. From all over the dermal surface there 

 stand out both diactinic and pentactinic jirostalia. The gastral sur- 

 face is smooth but may show in places the ends of some parenchymal 

 oxydiactins projecting beyond it. The subdermal space is evidently 

 of a quite insignificant width. The apertures of both the in- 

 curj'cnt and excurrent canals seem to be small as a rule. Lambe 

 gives 11 mm. as an average diameter of the larger and il mm. as 

 that of the smaller incurrent apertures of a specimen 100 mm. 

 high. The same specimen showed on the internal surface evenly 

 distributed excurrent apertures of about ^ mm. diameter. A 

 continuous endosomal layer is apparently not present over the 

 excurrent apertures, which thus seem to open free into the gastral 

 cavity. 



The single imperfect specimen, — 220 mm. high and 120 mm. 

 broad, — obtained by the " Albatross " near the Aleutian Islands 

 and referred to the present species by F. E. Schulze, requires 

 s])ecial mention in so far as it has, in contrast to the specimens 

 from Canada and California, very wide canals and subdermal 

 spaces, on which account the upper part of the wall is said to 

 have presented an a])pearance almost of a lamellar structure. It 

 seems to me that this structural deviation apparently extends 

 somewhat bevond the urdinarv ranoe of variabilitv to be exiDCcted 



I « O t J. 



ill different individuals of a Kossellid species. 



With respect to spiculatioa the more impurtant points, knuwn 



