ItlDKolHS (>K Till-: WOODS llol, |.; UK.u lo.\. 



Ci.YTIA. 



Trophn/wme. Colony not regularly branched. Hydrothecio with toothed margins and long 

 pedicels. 



(lononome. Gonangia containing goimphorcs which produce medusa- with 4 radial canals, 4 

 marginal tentacles at birth, and 8 lithocysts between the tentacle bases. 



Key to the specie* of t'li/l in fnniiil in Ilir Womh I Me re.ifion. 



Hydrotlioffp small, bell-shaped, with doc-ply rut ti-c-lh ('. bici/iiliora. 



Hydrothee;e small, eylindrical, \vi(h sharp teeth and short pedicels <'. fi/liii'lrtrn^ 



Hydrothectc larger, stout, broadly onmpaiuilate, or subtrianifiilar in outline, 



With large, evenly rounded tooth f. inilifiinnis. 



very lai'K*'. \vilh parallel sides and evenly rounded teeth t\ tj\-<t>:> . 



Clytia bicophora Ag. Fig. 21. 

 (Cont. Xat. Hist. U. S., iv, p. 304.) 



Trophoxome. Stem seldom branching, never regularly so. Hydrothecic 

 deeply campanulate, with about 14 pointed teeth. Pedicels large, long, annulated 

 at the ends, usual!}' smooth through the middle portion. 



Gonosome. Gonangia deeply and evenly ringed, resembling a Chinese lan- 

 tern, usually borne on the root stock, sometimes, on the stem. Medusa whpi 

 liberated hemispherical, with 4 tentacles and 8 lithocysts situated between the 

 bases of the tentacles, and a short manubrium. 



Distribution. Shallow water, attached to shells, other hydroids, seaweed, 

 etc. Found on the stems of Tubularin crocea growing on the piles of the U. S. 

 Fish Commission dock at Woods Hole. 



Both llincks and Verrill regard this species as identical with f'ltjtin john- 



sloni Alder, of British waters. I have carefully compared American specimens o^ 



( '. liimjiliom with specimens of C. johnsloni from England, and find that the former 



is a much more delicate and smaller species, the hydrothecse of C. johiifloni being 



on the average twice as long and wide as those of C. bicophoru. 



Clytia cyliudrica Ag. 

 (Cont. Xnt. Hist. r. S., iv, p. 306.) 



Trophosome. Stems unbranched, with pedicels shorter than 

 in C bicophoru, annulated at the proximal and distal ends. H ydro- 



thecfe cylindrical, small, deep, with about 10 deeply cut, sharply 

 i.'. t -V. ,, 21. ClijtiabicoplioraAg. 



painted teeth. 



<;<i/io*ome. Gonangia slender, oblong, flattened, not annulated, containing devel- 

 oping medusas which escape singly. Medusae not described. 



Distribution. Much as in the last species. Found in Buzzards Bay and at Xauahon. 

 (A. Agassiz.) 



I have not seen this species, and have compiled the above dscriptions from the 

 writings of Louis and Alexander Agassiz. 



2-2. ciiilia noli- 

 formis 



Clytia noliformis (McCr,). Fig. 22. 

 (Campanularia naliformis McCr., Proc. Elliott Soc., vol. I, No. 1, . 194.) 



Trophnnome. Pedicels short, unusually not more than twice as long as the hydrothecte, strongly 

 annulated, rising from a creeping rootstock. Hydrotheae broadly campanulate, with 10 to 12 very 

 prominent, deeply cut teeth with rounded points. Texture of hydrothecfe stater than in other 

 species of the genus. 



Gonomme. My specimens are without gonangia, and' I have been unable to find an^ description 

 of them. 



It is not certain that this species occurs in the Woods' Hole region. Dr. Agassiz reports it from 

 Buzzards Bay, but as he considers it identical with the ('///tin c/i/iiiili-irii of his father's work, a species 

 that appears to me to be distinct, I am not sure whether he had McCrady's species or not. My own 

 specimens came from Beaufort, N. C. 



