1903.] NATURAL SCIE^XES OF PHILADELPHIA. 411 



face of the parapf)diuin. Toward the ends of the body the number 

 of branchial filaments diminishes. 



The parapodial dorsal and ventral cirri are much the same as in 

 L. chitinoformis , but the dorsal cirrus is somewhat shorter, just barely 

 reaching the ventral setse tips; its knob is generally more spherical, 

 and its basal glands, while similarly arranged, much longer. 



Both dorsal and ventral setse are similar in their arrangement to 

 those of L. chitoniformis . The former are shorter than in that 

 species, leaving the entire bearded portion of the ventral setse exposed 

 from above, and are more slender, softer and more densely provided 

 with longer lateral processes, which are arranged either in tufts or 

 whorls, the exact arrangement being uncertain owing to the presence 

 of an incrustation of foreign matter. The latter are somewhat stouter, 

 with shaggier beards of fewer rows of hairs; one was found with a 

 terminal sheath still partly in place. 



In number, arrangement, form, and even in the character of their 

 papillae and cilia, the elytra of this species approximate those of 

 L. chitoniformis. The chief difference lies in the larger size of the 

 granules and the strong tendency of the papillae to become spinous. 

 The papillae immediately surrounding the low scar ridge are of a stellate 

 form with long, sharp-pointed rays bearing one or more conical 

 spinous on the upper side. The largest of this tj^pe are posterior to the 

 ridge, where occur also a few nearly globular papillae bearing a single 

 long conical spine. On the medial side of the scar ridge these papillae 

 become gradually more irregular and oblique, finally passing into the 

 smaller papillae whose pointed summits are directed toward the pos- 

 terior margin of the scales. Toward the covered area of the scale all 

 papillae become smaller and smoother, and soon low, rounded and color- 

 less. Clavate papillae occur in the lateral area, and in a postero-lateral 

 marginal row ; they are relatively smaller and much more slender than 

 in L. chitoniformis and bear numerous prominent conical points instead 

 of rough nubs. The erect ones of the lateral area bear a number of 

 spines, varying with the size of the papilla, along all parts of their 

 sides and summits, whereas the reclining ones of the marginal row have 

 spines on the upper or exposed surface only. Over the region of the 

 scar, in addition to the stellate papilke, which there attain their maxi- 

 mum size, are from 4 to 6 particularly prominent papillae crowned 

 with numerous short spines arranged in a tuft. In spite of their rough- 

 ness all of the papillae, even the largest, are soft. The covei'ed i3ortions 

 of the scales and the lateral zone are colorless, the middle and pos- 

 terior parts yellowish-brown, against which the various colored papilkifi 



