1905.] NATURAL SCIENCES OF PHILADELPHIA. 565 



The branchial lobes are very .mall, barely reaching *; bjcler o; 

 the collar, stiff, thick, very little free, lacking all trace of the dorsa 

 appendag; or lappet of some species; the ventral end 1--; -' ^ ;^ 

 produced nor involute, without a thin membrane, and partly unitrf 

 r t fellow of the opposite side. Twenty-two pairs of b-chi. ^e 

 present in each specimen. Except that those of one side are in process 

 ofCneration Til are of approximately equal length and are entire y 

 separate to the base. The external surface of the stems is wider than 

 theTnternal flattened and provided with lateral angles but no wmgs. 

 The e is no indication of eyes. The barbs are numerous and closely 

 arrlnged in 2 ranks ; they increase in size regularly from the base for | 

 tteTen^h of the stem, ihose at the distal end of this region being 3 

 times the length of the basal ones and i the width of the thorax; in the 

 liTtal Tthey again decrease, leaving a filamentous tip equal to tire basal 

 barbs. Several of the basal barbs of the doi^almost branchiae are 



""ThetnS^l;oiis, flaring collar has very large dorsal lobes, separated 

 by the dorsal fissire and bounded laterally by large, deep incisions 

 Mdwiy between the dorsal fissure and the collar seta,; these dorso- 

 toteraUncisions are partly filled by a small, thin lobe arising from the 

 bottom. The laterarportion of the collar rises in an even curve to tl« 

 same height as the dorsal lobe, its margin is slightly wavy bu not at 

 Jnotchrf nor produced into ventral lobes. b"t — - b,.adly 

 rounded below and overlaps the ventral fissure from both sides 



Smembranesare promi„ent,but present no character, ic^^^^^^ 

 Th^ tentacles shghtlv exceed the collar in length and have a thick 

 ^l^driMlpering to a'free end, the basal half being provided on each 

 side with broad margins folded together. 



On a specimen preserved outside of the tube the thorax is broad and 

 depressed and tapers regularly from the collar segment into the mor 

 sknder t rete abdomen. The second example, having been removed 

 om a tube after preservation, is more nearly ^y>'-'-^ *™;^\;^^ 

 All seoments are very distinctly indicated and umannulate The type 

 possesses 9 thoracic (8 setigerous) and 28 remaining abdomma seg- 

 ;;°e"ranother specimen has 10 thoracic (9 setigerous) and 58 abdomi- 

 nal segments, both, of course, being incomplete. 



Although the dorsal fissure is deep on the anteuor 2 thoiacic se 

 metts fte fa^cal groove is not discernible on the thorax. On the abdo- 

 Z^ll s deep and conspicuous, and can be traced around the right side 

 rthe fin.rabdominal segment until it disappears in the furrow 

 anterior to the set^e. 



