ASCIDIAE SIMPLICES CYNTHIIDAE 



75 



Sub-Fam. 2. Cynthiinae. More than eight folds in branchial 

 sac (Fig. 36, A); tentacles compound (Fig. 37, B) ; body sessile 

 or with a short stalk (Fig. 

 39, F). The chief genus 

 is Cynthia, Savigny, with 

 a large number of species, 

 some of which are British. 

 Rliabdocynthia has echin- 

 ated calcareous spicules in 

 the mantle (see Fig. 50, D, 

 p. 87). 



Forbesella tessellata is a 

 remarkable British species, having the test marked out into plates 

 (Fig. 39, B). It is intermediate in some characters between 

 Styelinae and Cynthiinae. 



Sub-Fam. 3. Bolteninae. More than eight folds in branchial 

 sac; tentacles compound; body pedunculated (Fig. 38, A). The 

 chief genera are Boltenia, Savigny, with the branchial aperture 



At-.--, 



FIG. 37. Tentacles of Cynthiidae. A, Simple, in 

 Styelinae ; B, Compound, in Cynthiinae. 



FIG. 38. Culeolus wyville-thomsoni, Herdman. A, from left side (half-nat. size) : B, 

 part of branchial sac. At, Atrial aperture ; Br, branchial aperture ; br/, branchial 

 fold; i.l, internal bar; sp, spiciiles ; tr, transverse vessel. (After Herdman.) 



four-lobed, and the stigmata normal ; and Culeolus, Herdman 

 (Fig. 38), with branchial aperture having less than four lobes, 

 and the stigmata absent or modified (Fig. 38, B), the branchial 

 sac showing a wide mesh-work of vessels stiffened by branched 

 calcareous spicules. Culeolus is a deep-sea genus discovered by the 



