THE SYSTEM OF PIIYLLOPHORIN^E. 



8 9 



contraction. Its surface rough to the touch, due to the presence of 

 tall-spired tables. 



Tentacles. — Twenty in number, of which ten are smaller than 

 the rest. 



Pedicels. — -Papilla-like, contracted, distributed all over body 

 surface in more or less conspicuous zonal arrangement. 



Calcareous deposits. — In general perisome there are found tables 

 only (textfig. 7, b-f). Disk usually of rounded outline with even 

 margin; many-holed ones often elongate. Diameter of disk 0.08 — 0.17 

 mm., commonly about 0.12 mm. Holes number 8 — 36; most com- 

 monly 10 — 15 besides a large central one. Spire stands over the 

 central hole and is very tall, measuring o. 10 — 0.20 mm. in height ; 

 toothed on top (e — f). It consists usually of four pillars united by 

 cross-bars, up to eleven in number. Tables in the anterior body 

 region (b) have in the disk more number of larger holes than those 

 in the middle and posterior regions (c — d). In the introvert, rosettes 

 (i — j) of 0.02 — 0.08 mm. length alone are profusely found, while at 

 its border with the main body there are found, in addition, some 

 delicate rods in scattered distribution. Pedicels are supported by 

 tables similar to those found in general perisome ; only the disk is 

 usually of an elongate and irregular shape, but never of the form 

 described by SluitER from his specimen as " zweischenkeligc Gebilde 

 mit durchlöcherten Enden." End-plates are well developed, exhibit- 

 ing markedly concave surface on the side facing the end of pedicel ; 

 diameter 0.25 — 0.33 mm., the larger ones belonging to ventral 

 pedicels. Tentacles with delicate bent supporting rods (g — h) 0.04 — 

 O.16 mm. long, with both ends branched and giving rise to some 

 holes ; often giving off branches in the middle parts also (h). Besides 

 these rods there exist rosettes, which arc connected with them by 

 some transitional forms. Around anus there are, besides rosettes and 

 tables, five minute anal teeth, each composed of a stout basketwork. 

 Anal papilla; are supported by delicate branched rods resembling 



