26g J. Playfair McMukrich, 



15. Sar/artia herpetodes ti. sp. 



No. 168. Tumbes near Talcahuano. 13 speciniens. 

 218. Puerto Montt. 5 specimens. 



364 a. Tumbes near Talcahuano. 1 specimen. 



The base in all the specimens is adherent and the column is 

 low and, in the smaller specimens, practically cjdindrical, though in 

 the larger ones it is more or less oval in section (Fig. 53) and in 

 the largest is very mnch elongated in one of its transverse axes so 

 that it might almost be described as having the form of a thick 

 band (Fig. 54). The. column wall in nearly all cases has attached 

 to it particles of sand and shell, and these adhere with considerable 

 force, suggesting the existence of well developed Verrucae; no such 

 structures can be observed, however, by the naked eye on the bare 

 portions of the column and even the microscope does not reveal such 

 definite Verrucae as might be expected. Acontia protruded freely 

 through the column wall in several individuals, but there were no 

 cinclidal tubercles to be seen, nor did there seem to be any 

 regularity in the arraugement of the openings through which the 

 acontia passed. Transverse and longitudinal furrows occur upon 

 the column wall, but these are evidently due to contraction. 



The majority of the individuals are expanded. allowing a 

 complete view of the tentacles and disc; some of the smaller 

 specimens, however, are contracted, one completely so. There is no 

 definite margin, the outermost tentacles being seated at the junction 

 of the disc and column. The tentacles are short, rather slender and 

 acuminate and are arranged in about four sub-equal cycles; there 

 is, however, little definiteness in their number as will be readily 

 understood from the arraugement of the mesenteries. 



The disc is smooth and translucent and is perforated by a 

 varyiug number of mouths. In the smaller specimens there is a 

 central niouth and a varying number of smaller ones situated near 

 or even among the bases of the tentacles. In the more oval 

 individuals there are two larger mouths, whose longer axes are at 

 right angles to the longer axis of the body (Fig. 55) and in the 

 largest elongated specimen there were three large mouths, whose 

 longer axes corresponded with that of the disc. The smaller more 

 peripheral mouths vary in number; in one of the oval individuals 

 there were only three (Fig. 55), but in the individual from which 

 Fig. 53 was drawn there were no less than twelve, situated near 



