. Natural history. Zoology. fi£7. 13.—King-Crae (Limulus moluccanus). Keduced, short, and are entirely covered by the shields. The few living species known are found in the East and West Indies, and on the East coast of North America, living in shallow water, or running over and burrowing in the sand. The species figured, Limidus moluccaims (Clusius), has larger spines than the others. The Limulia sometimes attain a length of two or three feet. They are the last survivors of a great group of Crustaceans, now only imperfectly known by their fossil remains. Three other orders, now wholly extinct
. Natural history. Zoology. fi£7. 13.—King-Crae (Limulus moluccanus). Keduced, short, and are entirely covered by the shields. The few living species known are found in the East and West Indies, and on the East coast of North America, living in shallow water, or running over and burrowing in the sand. The species figured, Limidus moluccaims (Clusius), has larger spines than the others. The Limulia sometimes attain a length of two or three feet. They are the last survivors of a great group of Crustaceans, now only imperfectly known by their fossil remains. Three other orders, now wholly extinct, are referred to the Cfigantostraca: the Merostomata, the Setniaspida and the Trilobita. Some authors have recently proposed to regard Limulus as more nearly allied to the Arachnida than to the Crustacea; but its external resemblance to the latter is certainly far more obvious. SUB-CLASS IV.—PYCNOGONIDA. These are sluggish animals, found among sea- weeds on the sea-shore, and somewhat intermediate between Arachnida and Crustacea. The front of the body consists of four well-marked segments, the first of which is formed of three fused together, each bearing a pair of long, jointed legs, and the abdomen is very small. They are provided with a long suctorial proboscis. In their young state, they are parasitic on Hydractiuke, and are pro- vided with three additional pairs of limbs, which was short or wanting in the Fig. U.—Pycnofionum morale, Miiller. Nat. size. CLASS II.—ARACHNIDA (SPIDERS, SCORPIONS, AND MITES). This rather extensive group of animals is generally recognisable by a few salient characters. Tlie head and thorax, instead of being separated, as in insects, are usually fused together into a single mass, called the cephalo- thorax; there are two pairs of jaws, one pair of which are sometimes regarded as modified antennas ; from two to twelve simple eyes, variously arranged in different species ; and usually eight pairs of legs, all situated on. Please
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