AUTOLYTUS MACROPHTHALMUS. 459 
Habitat.-—Dredged in Plymouth Sound (Allen). 
Occurs at Spitzbergen (Malmgren) ; coast of France, Dinard (De St. Joseph) ; Marseilles 
(Marion) ; Adriatic (Marenzeller) ; Madeira (Langerhans). 
De St. Joseph found Trichodina auerbachu on the appendages. 
The species (Plate CX XXV, fig. 13, head) is apparently more common in the south 
than in the north. De St. Joseph observed segmental organs of an orange colour in each 
segment after the fifteenth. He describes two kinds of bifid bristles, viz., those with short 
and those with long tips. The dorsal cirri of the second and fifth segments are longer than 
the following, which are unequal amongst themselves. 
AUTOLYTUS MACROPHTHALMUS, Marenzeller, 1875. Plate CXXXV, fig. 15—head and 
anterior region ; 15a—b—anterior and posterior bristles. 
Specific Characters.—The head is distinguished by the large size of the four eyes, which 
cover a considerable portion of the surface, occasionally with a few additional specks. The 
tentacles are long, and the median exceeds the lateral. The palps are ciliated ventrally. 
Body 8—20 mm. in length, and with sixty-seven to eighty segments, and is terminated 
posteriorly with two rather thick anal cirri. The proboscis makes a single convolution, 
and has anteriorly sixteen to twenty nearly equal soft papillae provided with palpocils. Its 
anterior muscular fibres are well developed. ‘The violet or reddish proventriculus is barrel- 
shaped and occupies segments 8—10 or more when elongated, and has thirty-eight to forty- 
four rows of violet points. The intestine anteriorly (hepatic, De St. Joseph) and posteriorly 
(urmary, idem) has in its walls concretions which disappear with effervescence on adding 
nitric acid. Bristles correspond with those of the type; in the thirty-nine posterior 
segments there is an awl-shaped process at the joint. Develops directly, eggs being red, 
or by stolons. Colour of body light orange, tips of tentacles orange. 
SYNONYMS. 
1876. Proceraa macrophthalma, Marenzeller. Sitzb. der K. Akad. Wien, Bd. 1xxi, sep. abdr., p. 165, 
pl. iv, fig. 2. 
1879. > s Langerhans. Geitschr. f. wiss. Zool., Bd. xxxu, p. 579, pl. xxxii, 
fig. 29. 
1886. Autolytus (Procerea) macrophthalma, De St. Joseph. Aun. Se. nat., 7° sér., t. i, p. 226. 
1908. As macrophthalmus, Elwes. Journ, M. B. A., vol. vin, p. 201. 
1914. be macrophthalma, Southern. Proc. Roy. Irish Acad., vol. xxxi, No. 47, p. 41. 
1915. 4 FA Allen. Journ. M. B. A., w.s., vol. x, p. 604. 
iO 2Ae * macrophthalmus, McIntosh. Ann. Nat. Hist., ser. 9, vol. viii, p. 307. 
Habitat—Dredged in various parts of Plymouth Sound (Allen); between tide-marks, 
Torquay (Elwes) ; Clew Bay (Southern). 
Abroad it occurs in the Adriatic (Marenzeller) ; shores of France, common at Dinard 
(De St. Joseph) ; Madeira (Langerhans), where it occurs amongst alge between tide-marks. 
The head (Plate CXXXV, fig. 15) is distinguished by the large size of the eyes, which 
cover a considerable portion of the surface, and there are occasionally a few additional 
specks. The length of the body varies from 8—20 mm. The violet or reddish proboscis 
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