350 HARMOTHOE AREOLATA. 



The head (Plate XXVII, fig. 15) of this species is distinguished by its somewhat 

 ovoid outline and the prominent peaks in front. The eyes are of moderate size — two on 

 the dorsum posteriorly in front of the nuchal fold and quite within the margin of the 

 head, and two at the outer and under surface of the peaks, so that they look forward 

 and slightly outward. The median tentacle is of moderate length, and tapers from the 

 base towards the tip, which is filiform and densely covered with rather long cilia having 

 slightly bulbous tips. Scarcely a perceptible swelling in the preparations occurs below 

 the tip. The cilia diminish in length distally, but extend along part of the filiform tip. 

 The lateral tentacles arise below and somewhat external to the median, are short, and 

 taper from the base to the filiform extremity. Short cilia occur on the surface and on 

 the filiform extremity as small papillae. 



The tentacular cirri are similar to the median tentacle. The palpi are of moderate 

 length, gently tapered from the base to near the apex, which is filiform, though short. 

 They have densely crowded rows of clavate papillae — more slender than in Harmothoe 

 imbricata, and which gradually diminish from below upwards. 



The body presents the usual slight convexity dorsally with the transverse depression 

 in each segment — especially marked behind the proboscidian region. Moreover much 

 of the body is of uniform breadth. Ventrally a central depressed area occurs in spirit, 

 with lateral elevations, from which the rather small segmental processes project between 

 the feet. Posteriorly it terminates in the caudal cirri. 



Proboscis. — The proboscis is less massively muscular than in Lagisca or Harmothoe 

 imbricata, and the horny teeth are smaller; indeed, they may be called minute. The 

 horny ridges are also less prominent, The terminal papillae of the organ agree with 

 those in Harmothoe. 



In the peripharyngeal space only one short pregastric caecum goes forward to the 

 second segment in front of the stomach. The second is nearly transverse. The 

 reduction of the caeca is thus a marked feature. 



The scales (Plate XXXII, fig. 17) are somewhat stiff and leathery, especially in 

 front. The first pair are more or less rounded, and thickened by the numerous large 

 chitinous areas terminating in the blunt spines, which are minutely nodular with short 

 chitinous spikes. The surface of the scale is further cut into definite areas by a series of 

 chitinous reticulations which enclose the space occupied by each bluntly conical spine, 

 and consequently in this (the first scale) irregular hexagons, pentagons, or similar 

 figures occur in the central region round the large bosses, while the margin is cut into 

 longer areas with intermediate small triangles — for spines — at the edge. Moreover the 

 right or upper differs from the left or under scale, the former corresponding more 

 particularly with the description, while the latter in the region overlapped by the former 

 is thinner, and has numerous smaller reticulations enclosing a diminishing series of horny 

 papillae from the central region of larger spines to the edge. The latter is also smooth, 

 but, with this exception, the edge has cilia all round, and of considerable length as well 

 as more numerous at the outer margin. The right or upper first scale shows a 

 continuous series of marginal cilia. The succeeding scales are more or less reniform or 

 somewhat ovate, according to their position, while the last are almost D-shaped. Their 

 general structure is similar, viz. the anterior and inner edge, that overlapped, being more 



