112 RITTER 



HARRIMANIA gen. nov. 



EXTERNAL CHARACTERS. 

 Animal short in proportion to its thickness, not only as a whole, 

 but in each of its three regions. Proboscis somewhat depressed, 

 conical, but little longer than broad ; in preser\^ed specimens almost 

 always contracted so as to become considerably shorter than broad. 

 Collar short, always broader than long, usually in preserved specimens 

 greatly so. Pharyngeo-genital region without genital pleuras ; not 

 clearly set off from the abdominal region ; frequently much depressed, 

 so as to be considerably broader than deep. Gonads beginning im. 

 mediately behind the collar and extending either not at all or only a 

 short way behind the pharynx, in the form of rather large, irregular 

 lenticular masses. An inter-, as well as an extra-branchial series on 

 each side. Maximum number of branchiEe about 40 pairs, these 

 opening wholly on the dorsal aspect of the animal, in a well-defined 

 ditch on each side ; both walls of each ditch composed chiefly of the 

 extra- and inter-branchial gonad series, respectively (PI. VII, fig. 2). 

 Length of pharynx about double that of proboscis. No external liver 

 lobes ; no constriction between pharynx and abdomen. Abdomen 

 nearly round in transverse section, relatively short, and tapering rather 

 abruptly to its posterior extremity. The following measurements in 

 millimeters are from an average adult living specimen : Length of pro- 

 boscis 13 ; length of collar 4; length of pharynx 25 ; length of gonad 

 series 27 ; length of abdomen 89 ; total, 131. 



Color. — General shade dark. Proboscis dark gray, mottled, par- 

 ticularly on dorsal side, with many somewhat elongated, almost coal- 

 black spots. Collar also dark and mottled, though less strikingly so 

 than the proboscis. Gonads a yellowish white, but all the remaining 

 portions of the pharyngeo-genital region dark, the dorsal side con- 

 siderably more so than the ventral, the latter yellowish green; an- 

 terior portion of abdomen dark grayish green ; posterior portion 

 similar to it, but somewhat lighter. On the whole this is probably 

 the darkest species of Enteropneusta known. 



ANATOMICAL CHARACTERS. 



Proboscis. — Circular muscle layer about equal in thickness to the 

 nervous layer of the ectoderm. Longitudinal muscle fibers arranged 

 in radiating plates as in Ptychodera. No central proboscis cavity, 

 but in place of this a core of considerable size of very fine-fibered close- 

 meshed connective tissue containing many small nuclei. In place of 



