STHBNELAIS LIMICOLA. 419 



base of the palpus. His view of the parts, indeed (Taf. iv 9 fig. 6), differs from what 

 our specimens would have exhibited in life. 



Proboscis. — The teeth are similar to those of 8. boa, the lower pair apparently 

 biting in front of the upper ; but preparations are not always to be relied on in this respect. 

 The number of conical papillas dorsally and ventrally is eleven. It is curious that few or 

 none eject the organ in spirit, whereas the gastric juice of the stomach of the cod causes 

 full protrusion, the broad end of the trumpet-shaped structure being distal. Moreover 

 a pair of oblique elevated ridges occur dorsally and ventrally near the tip. 



Body. — The body is elongate, some of the imperfect specimens being nearly two 

 inches in length. Ehlers gives 57 mm. and 128 segments, and one of the contracted 

 perfect forms is larger than Ehlers' examples. Pruvot and Racovitza record a length 

 of 95 mm., and a total breadth of 4 mm. It tapers posteriorly to a delicate tail which 

 has two caudal cirri. The body is rounded dorsally, flattened ventrally. A segmental 

 eminence occurs at the base of each foot, but no distinct papilla. 



Scales numerous, translucent, rounded in front, irregularly ovate or somewhat 

 reniform posteriorly, and cover the back. They are of a light brownish hue, best marked 

 in front. They occur on segments 2, 4, 5, 7 — 25, and on all the others (Ehlers). The 

 first scale, which has the scar for attachment behind its centre, presents a series of short 

 clavate cilia along its outer border, and a few longer digit-like cilia at its anterior and 

 outer margin. 1 Finely branched nerves pass from the scar throughout the scale. Its 

 surface is quite smooth. The typical anterior scale (Plate XXXIY, fig. 9) has externally 

 a thin folded margin possessing irregular processes, either simple, bifid, or divided into 

 several flaps. The surface is smooth, though often crossed in the preparations by fine 

 lines, probably creases or folds. Between the elytrophore and the anterior curvature, and 

 stretching on each side beyond, is a series of rounded bodies like papillse (the " petit 

 tubercles irreguliers " of Pruvot and Racovitza), but they do not project from either 

 surface of the scale, and appear therefore to be internal, as a reference to the condition 

 in the posterior scales more clearly demonstrates. 



The posterior scales (Plate XXXIV, fig. 10) are bilobed externally, each lobe 

 forming a rounded process, which either approaches its fellow over the T-shaped fissure 

 or slightly overlaps. Moreover in the terminal scale a belt of large vesicular organs 

 occurs in the granular layer of the epiderm, in front of the scar for attachment. They 

 consist of a large pale central region surrounded by a ring of smaller bodies. Each of the 

 large circular vesicles has a cell with a nucleus and nucleolus, and the ring seems to be 

 composed of nucleated granular cells. They indeed resemble papillas with a ring of 

 secondary processes at the tip, but they appear to be internal, and a further development 

 of the structures noted anteriorly. These continue to the posterior extremity. 



At Banyuls Pruvot and Pacovitza found a large transverse touch of brown on the 

 posterior region of the scales, and between the elytrophore and the anterior curve a 

 few minute tubercles, best marked and most numerous in the posterior scales. As 

 above mentioned, however, these structures project neither from the dorsal nor the 

 ventral surface of the scale ; they are vesicular and internal rather than tubercular and 

 external. 



1 Neither Ehlers nor Pruvot and Racovitza mention these. 



