. A catalogue of the British non-parasitical worms in the collection of the British Museum. Worms. PROTULA. 265 numerous, united at the base into a short cartilaginous stalk, by which they are attached to the head. Each filament is densely pec- tinated with a ciliary fringe, and, in specimens preserved in spirits, these cilia always assume a unilateral character. Between the tufts, and at their base, is a pair of setaceous tentacula ; and the cephalic segment is encircled with a free cartilaginous wavy margin, which is everted and produced into an obtuse lobe on the dorsal aspect. Thorax of se
. A catalogue of the British non-parasitical worms in the collection of the British Museum. Worms. PROTULA. 265 numerous, united at the base into a short cartilaginous stalk, by which they are attached to the head. Each filament is densely pec- tinated with a ciliary fringe, and, in specimens preserved in spirits, these cilia always assume a unilateral character. Between the tufts, and at their base, is a pair of setaceous tentacula ; and the cephalic segment is encircled with a free cartilaginous wavy margin, which is everted and produced into an obtuse lobe on the dorsal aspect. Thorax of seven equal No. XLV.—Protula protensa. seven equal seg- ments, margined with a narrow brown skin on each side. In the middle of its dorsal side there is a linear-elliptical area bounded by a dark line, and continued down the abdomen for a short way, when it is lost in the mesial line. The abdo- men consists of numerous very narrow segments, nearly alike, but insensibly narrowed back- wards. Along the ventral sur- face a ribbon-like elevated ten- dinous band runs from one ex- tremity to the other, so that the sides on which the setige- rous feet are placed are di- stinctly defined and depressed. There are seven pairs of feet to the thorax, with an equal num- ber of linear series of uncini: the feet of the abdominal por- tion are very numerous, and the uncini are in a shorter and more elliptical arrangement. The bristles are of different sorts: the fascicle of the tho- racic foot consists of a great number divided into three sets ; —the upper set are of a clear yellowish colour, setaceous, but bent towards the top and brought to a long sharp point with a narrow cutting edge on the outer side of the bend ;— the middle set are stouter and shorter, with a dark lance- shaped point, which is either sti^ight or a little curved;— and the lower set are weakest, transparent straw-yellow, acicular, the long point being brought to a cutting edge on both sides. There are none of the da
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectworms, bookyear1865
