AMERICAN HYDKOIDS. 115 



Gonosome. Uiikiiown. 



Locality. Lat. 25 33' N., long. 84 21' W.; depth, 101 fathoms. 



This appears to be a species carrying tlie sleuderness of the hydrothecie to the extreme limit 

 found among the Plumularidae. I have not seen this form, and therefore quote the original 

 description entire. 



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



CLADOCARPUS GRANDIS, new species. 

 (Plate XXVIII, figs. 3-5.) 



Trophosome. Colony somewhat sparsely branched, attaining a height of 25 inches, each plume 

 having a "spread" of about 4 inches; stem fascicled, greatly compressed laterally, so as to form a 

 band-like structure, especially in the distal portion, the tubes being placed one directly behind 

 the other in antero-posterior rows, so that in a cross section of the stem there will be eight or nine 

 rows of tubes from the front to the back, and only three counting from side to side; the anterior 

 tube bears the hydrocladia; hydrocladia alternate, stout, attaining a length of 2 inches, straight, 

 composed of regular rather stout iuternodes, which have only one poorly marked septal ridge 

 opposite the equally insignificant iutrathecal ridge. Hydrotheca- closely approximated, very 

 large, short and thick, widening toward the top; anterior profile somewhat sinuous; margin 

 smooth with the exception of two blunt teeth, widely separated, forming a lip like that of a pitcher; 

 intrathecal ridge hardly apparent; supracalyciue nematophores short, with an expanded upper 

 posterior corner which attains a level somewhat higher than that of the hydrotheca; margin finely 

 crenulated; mesial nematophore short and stout, adnate to the front of the hydrotheca; cauline 

 nematophores in close-set rows along the tubes of the stem, regularly spaced, so that the entiie 

 stem is armed with both longitudinal rows and transverse bands of nematophores. 



Oonosome. (lonangia borne on phylactogonia, ovate, with round terminal apertures; phylac- 

 togonia borne on the proximal iuternodes of hydrocladia, straight, divided into regular internodes, 

 each of which bears a straight, short branchlet, with a gonangiuin in its axil and two or three 

 short, stout nematophores. There are usually three or four, sometimes five or six, of these 

 alternate branchlets. 



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

 Albatross Station 266 , lat. N. 29 16', long. W. 79 36'; depth, 438 fathoms; Albatross Station 

 2662, lat. X. 29 24', long. W. 79 43'; depth, 434 fathoms; Albatross Station 2666, lat. 1ST. 30 48', 

 long. W. 79 49'; depth, 270 fathoms: Albatross Station 2667, lat. N. 30 53', long. W. 79 43'; 

 depth, 273 fathoms; Albatross Station 2669, lat. N. 31 9', long. W. 79 34'; depth, 352 fathoms. 



This magnificent species is the largest Cladocarpus yet discovered. The great length of the 

 pinme gives it a particularly striking appearance. The band like structure of the greater part of 

 the stem and branches will at once distinguish the species from G. paradisea, its nearest relative. 



Type slides. Cat. Nos. 186SO, 18681, U.S. KM.; Cat. Nos. 15382, 15383, Mus. State Univ. 

 Iowa; also in the collection of the author. 



CLADOCARPUS PARADISEA Allman. 

 (Plate XXVIII, figs. 6, 7.) 



Cladocarpus paradisea ALLMAN, Mem. Mus. Comp. Zool., V, No. 2, p. 53, pis. xxxii, xxxni. 



Trophosome. Colony branched, attaining a height of 16 inches; stem fascicled, except the 

 distal portion, where it is regularly divided into internodes, each of which bears a hydrocladium 

 on a process from near its distal end; hydrocladia rather distant, long, and directed laterally, 

 composed of rather slender internodes, each of which has about five slight septal ridges just 

 behind the hydrotheca. Hydrothecse 7iot closely approximated, large, deep, cylindrical, with a 

 slight bulging. in the middle, and two broad and shallow teeth on the anterior part of the margin, 

 which is otherwise plain; intrathecal ridge indistinct, appearing as a thin wavy horizontal line 

 dividing the hydrotheca near its middle; supracalycine nematophores very broad, scarcely over- 

 topping the hydrotheca and with a constriction on the posterior side; mesial uematophore small, 



