AMERICAN HYDROIDS. 119 



internode; those ou the distal part of the hydrocladium completely adnate to the internode; mar- 

 giu armed with about nine broad but sharp-pointed teeth, of nearly equal size; intrathecal ridge 

 strong, oblique; supracalycine nematophores tubular, with crenulated margins, overtopping the 

 hydrothec;i j ; mesial nematophore divided into two parts which are widely divergent, their crenula- 

 ted margins beiug almost on a line with thoseof the supracalyciue pair; the proximal hydrotheca 

 on the hydrocladia-bearing protective appendage has only one mesial uematophore; cauline nerna- 

 tophores very large, butterfly-shaped, arranged in a row on the front of the stem; opposite the 

 origin of each hydroeladium is a long tubular nematophore, and there is a perforated process at 

 the base of each hydrocladium. 



(ionosomc. Gouaugia oblong-oval, attached to the front of the stem near the bases of the 

 hydrocladia, and protected by a jointed unbranched appendage springing from the base of the first 

 hydrotheca on the adjacent hydroi'ladiuiu, and replacing one of the two mesial nematophores of 

 that hydrotheca. This appendage bears a single row of strong tubular uematophores, and some- 

 times a terminal hydrotheca. The axial cavity of the appendage is divided by numerous internal 

 septal ridges. 



Distribution. Blake Station 316, lat. N.32 07', long. W. 78 37'; depth, 229 fathoms; Albatross 

 Station 2415, lat. N. 30 44', long. W. 79 26'; depth, 440 fathoms; Albatross Station 2663, lat. 

 N. 29 39', long. W. 79 49'; depth, 421 fathoms; Albatross Station 2667, lat. N. 30 53', long. W. 

 79 43'; depth, 273 fathoms; Albatross Station 266S, lat. N. 30 59', long. W. 79 39'; depth, 294 

 fathoms; Albatross Station 2(569, lat. N. 31 09', long. W. 79 34'; depth, 352 fathoms. 



This is one of the most striking of the many interesting pluuiularians obtained by the Blake and 

 Albatross. The double mesial nematophore is quite unique, and the very large cauliue uemato- 

 phores remind one somewhat of those found in some species of Lytocarpus (for example, L. clarkei). 

 The variation in the degree to which the hydrotheca are adnate to their iuternodes is very great. 

 Indeed, one could easily imagine two hydrothecse, one from the proximal and another from the 

 distal part of the same hydrocladium, to belong to entirely different species. 



A comparison with Dr. Fewkes's type from the Museum of Comparative Zoology shows that 

 the Blake and Albatross specimens are identical. The double nature of the mesial uematophore is 

 only seen in front view, and thus escaped the original describer. 



Type. In the Museum of Comparative Zoology, Cambridge, Massachusetts. 



AGLAOPHENOPSIS (?) DISTANS, new species. 

 (Plate XXX, figs. 1, 2.) 



This species is described from a fragmentary specimen. 



Trophoxome. Colony unbranched, attaining a height of about one inch; stem not fascicled, 

 divided into regular internodes, each of which bears a hydrocladium on a stout process from its 

 middle portion; hydrocladia slender, sinuous, divided into regular internodes, each of which has 

 about eight septal ridges behind the hydrotheca, and four or five below it. Hydrothecie distant, 

 deep, anterior profile with a very slight double curve; margin with a strong anterior tooth, and 

 four or five very shallow lateral teeth or sinuations ou each side; intrathecal ridge not evident; 

 supracalyciue uematophores small, not reaching above the top of the hydrotheca; mesial nemato- 

 phore small, spur-like, separate, its distal end not attaining the level of the bottom of the hydro- 

 theca; margin creuulated; two cauliue nematophores near the axil of each hydrocladium, and one 

 below it on the anterior aspect of the iuternode. 



Gonosome. (Immature.) Gonangia subcyliudrical, truncate at the distal end, borne ou the 

 front of the stem; a short unbranched protective appendage grows from immediately behind the 

 proximal hydrotheca, and this appendage bears several uematophores, and a structure which 

 appears to be a developing hydrotheca. 



JHstribiition.Albdtroxs Station 2669, lat. N. 31 09', long. W. 79 34'; depth, 352 fathoms. 



This species may belong to the genus 'Cladocarpus. The gouosome on the single specimen 

 secured was so imperfectly developed that it is impossible to make out its characters with cer- 

 tainty. 



Type //<?<*. Cat. No. 18689, U.S.N.M.; Cat. Xo. 15392, Mus. State Univ. Iowa; also in the 

 collection of the author. 



