552 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Pi and Pa are very delicate and slender and measure about 11 mm. in length. 

 The pinnules of the next pair (P2 and Pb) are markedly longer, though always shorter 

 than those of the third pair (P3 and Pc), which are the longest and stoutest. P3 

 reaches 18 mm. in length and is composed of 25-30 segments, which except for the 

 basal are longer than broad. The pinnules of the fourth pair (l\ and Pd) are almost 

 always shorter, though they are of variable length and may even be longer than those 

 preceding. Following these there is a series of small pinnules of moderately equal 

 size, an increase in length being first observable from the fifteenth or sLxteenth pair 

 onward. The distal pinnules are about 9 mm. long. The disk is not present but was 

 apparently about 14 mm. in diameter. The color is light brown or light chocolate- 

 brown, with the central portion sometimes entirely light brownish wlute. 



Ilartlaub said that the single specimen of this species (Hagellata) previously known, 

 which is in the Leyden Museum, was first described by J. Miiller and later by Carpen- 

 ter. Its locality was unknown, but Carpenter correctly surmised that it was "orien- 

 tal." The specimens from Singapore that he studied are smaller than the type 

 specimen at Leyden, though in other respects wholly similar. Hartlaub believed the 

 form of the centrodorsal to be very characteristic. It is large and thick, and Carpen- 

 ter's designation "moderately thick" seemed to him not quite adequate for the type 

 specimen at Leyden, which he personally examined, or for those from Singapore. 

 In contrast to the type specimen, the centrodorsals of the specimens from Singapore 

 have strongly concave dorsal poles, while the number of cirrus segments in the latter 

 is not 40, as in the typo specimen, but scarcely more than 30-35. IVBr series, wluch 

 occur in the type specimen, are not present in any of the specimens from Singapore. 



Of the specimens collected at Singapore by Svend Gad four have the arms 90 

 mm. long and the cirri XL, 20 mm. long; they resemble very closely those described 

 by Hartlaub. Another is small. 



The specimen from Singapore collected by Dr. Th. Mortensen has 42 arms 

 about 130 mm. long. The cirri have 25-29 segments and are 24-30 mm. long. P2 

 is 10 mm. long, with 18 segments. P3 is 18 mm. long, with 25+ segments. The 

 disk is 2") mm. in diameter. 



The type specimen of Alecto flagellata, which was without locality, was thus de- 

 scribed by Miiller: There are 38 arms 150 mm. long. The cirri are XXXV, 30, long 

 and stout with low, flat segments of which the last, except for the claw, bears dor- 

 sally a clawlike process. The axillaries are very low, without a syzygy. Between 

 the syzygies of the arms there are 10 or 11 brachials, which are wedge-shaped, di- 

 rected alternately to the right and left. From the first to the third on the same side 

 of the arm the pinnules increase in length; these three first pinnules are very long, 

 those succeeding gradually decreasing in length. 



Carpenter redescribed the type specimen of Muller's Alecto flagellata as follows: 

 The centrodorsal is moderately thick, with a smooth dorsal surface and three irregular 

 rows of cirri on its sides. The cirri are about XL, 25-35. The segments are toler- 

 ably equal, hardly any of them in mature cirri being longer than broad. The lowest 

 segments are -hurt, the length increasing gradually up to the tenth, which is about 

 square. The nexl two or three segments are of the same shape or a trifle longer, 

 after which the length gradually decreases and a blunt dorsal spine appears near the 

 distal ends of the segments. It increases slightly in size for two or three segments, 



