94 TIIK AMKUICAN MONTHLY [April, 



13. Dictyoniitra multicostata. Zittel. — Slicll slcMukr. coni- 

 cal, with proiuiiu-nt l<iny;itiulinal lihs, ami tVoni ciy[lit to ten deep 

 strictures. Lentil aiul l>rcailth ol" the joints madiiaily incrcasiii*;, 

 thccifjhth joint hcinj^ twice as lonjj and hroad as the fonrth joint. 

 Pores re^jular. circnlar. one series in each loni^itndinal furrow, 

 three to tour pores in each joint. 



14. Dictyomitra polypora, Zittel. — Shell slender, conical, 

 rouvjh, w ilh six to nine deep strictures. Lenjjth and hreatlth of 

 the joints ijra«lually increasiuj;, so that the eij^hth joint is twice as 

 loni; anil hroad as the third. Pores rej^ular. ciicidar. in transverse 

 rows in each joint, the last joint havini; from five to six rows. 



15. Stichocapsa tyrrelli, n. sp. — Shell smooth, slender, 

 pear-shaped, tw ice as lon«; as broad, with three deep strictures. 

 Rel.itive len»;ths of the four joints, i : 1.3:4:3; rehitive hreailths 

 I : 2 : !^ : ^.^. Cejihalis spherical, hvaline. without pores. Tho- 

 rax hemispherical, with four transverse rows of rej^ular, circular 

 pores. The fourth joint is the broadest, but is shorter than 

 the larjjc campanuhite third joint. Pores in the second, third, and 

 fourth jt)ints of e(pial si/e, and .ill about as wide as the bars. 



16. Stichocapsa dawsoni, n. sp. — Shell smooth, irregular, 

 ovate, with three intern.il septal rin<][s, without cxtern:il strictures. 

 The third joint is the lar<;cst. beintj more than half :is lon<; as the 

 shell. Relative len<jths of the four joints. 1:1:5:1; relative 

 breadths, 1:2:4:3. Cephalis hemispherical, hyaline, without 

 pores. The second and fourth joints small, with three transverse 

 rows of re<jular, circular pores. The third joint ovate, with 

 truncated poles. ;nid from twelve to thirteen transverse rows of 

 subregular, circular pores. 



ItioloirimI Dcscripf i(»iis of (Vrlaiii ('(Miiinon H.vdroid 

 .Viiiiiials. 



liv II. L. OSBORN, 



ST. PAUL, MINN. 



{CoHtinucd from fagc <)().) 

 PODOCOKY.VE CARNEA .'* (figS. 17-1S). 



This is a marine animal. It lives attached to the shell of the 

 spider-crab, Libinia caiialiculata^ in the muddy, shelly bottoms 



* BiBLloc. — I. Claus Sedgwick. Tcx(-b. Zool., vol i,p. 237. 

 1. Lankestcr, E. Brit., ix, p. 560. 



3. (iegenbaiir, Comp. Anat., p. 94. 



4. Parker. Elementary Zoology, p. 236. 



5. I..aDK, Text-Hook of Zoolofty. 



6. Romanc*. Jellyfish, Starfish, etc. , p. 10. 



Explanation op Figures oh Podocokvnk. 



Fig. 17. Po<loO'ryne, from nature, >-liowing the reproductive person with the manubrium and 

 teiilaclcN, and theclu.<tered medusa buds in various sLigcs of development, showing the rhizold, 

 or stoli.ii -ill... ',• >\ m ilii^ case to th>- shell of the spider-crab. 



Kiu. •■'•xn n.iture, the medusa : rv, radial vessel ; vel, velum ; S.ku, sensory 



orgai •ycspot; mar. ten., marginal tentacles in two sets, four shorter ; man, 



them. I lie bell; or, the ovary in the ectoderm on the manubrium. 



