548 Prodromus of the 



of the same being only one half the greater : tentacles 12-15 

 in each bunch, " filiform, of moderate length, and propor- 

 tionately much thicker than in Luc. quadricornis, — and 

 ending in a thicker globular knob," the groups very close to- 

 gether, separated by a short interval in which the marginal 

 anchor is situated, — in at least four rows; four in each 

 of the three outermost rows, those in the fourth inner row 

 very young ; in each tuft, those in the next to the outer 

 row the largest, " those situated in the inner row are turned 

 outwards, those in the outer one with their ends bent down 

 around the tolerably thick margin of the body," the basal 

 septa, between which their channels open, do not reach 

 beyond the inner or proximal row of tentacles ; their posi- 

 tion is recognized from the aboral side of the urn by radiat- 

 ing furrows extending from the edge of the gelatiniform 

 layer a short distance toward the pedicel ; those on each 

 side of the anchors extend much beyond their base, and 

 opposite the four partitions of the urn nearly close up the 

 passage between the cameras : marginal anchor purely ten- 

 tacular, much smaller than the tentacles, its base nearer to 

 the margin than is that of the outer row of tentacles, and 

 partially overlying the marginal muscle : genital bands 

 extending about half way to the margin of the urn, ligu- 

 late, 6-8 uniserial saccules in each band ; the digitiform 

 bodies arranged in a single row from one end of the bands 

 to the other, and across their proximal junction ; the mem- 

 brane of the claustrum comparatively thick, and at least 

 twice as wide as the two enclosed genital halves together : * 



* In Allman's transverse section of a young Carduelln, (Mic. Joum. &c., ut sup.) 

 the approximated halves of the neighboring genitals are represented as if they 

 ivere one band, and there is no indication of a claustrum; this I can only account 

 for by supposing that the section was made just at the point where the distal ends 

 of the bands become confluent, as is the norm in this familj', and where also the 

 clanstral membrane merges into the oral side of the urn. I am well aware that 

 Allmaii calls them " four generative bands," but I cannot view them as such, and 

 on the contrary I consider them as the closely approximated halves of adjoining 

 genitals; each claustrum therefore encloses not a single genital, but the two halves 



