. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. MYRIAPODA. 451 resemble Insect larva that little can be said concerning them in addition to what the reader will find elsewhere stated. (See articles AN- NELIDA, CRUSTACEA, ARACHNIDA, INSECTA.) The antenna upon the head, which are in- variably two in number, correspond in all essential circumstances with those met with in Insects, and doubtless perform the same func- tions. The eyes when present, which is not the case in all the genera, exhibit the form of simple ocelli congregated upon the head, and arranged in lines or
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. MYRIAPODA. 451 resemble Insect larva that little can be said concerning them in addition to what the reader will find elsewhere stated. (See articles AN- NELIDA, CRUSTACEA, ARACHNIDA, INSECTA.) The antenna upon the head, which are in- variably two in number, correspond in all essential circumstances with those met with in Insects, and doubtless perform the same func- tions. The eyes when present, which is not the case in all the genera, exhibit the form of simple ocelli congregated upon the head, and arranged in lines or triangular patches ; but in no case do they exhibit the appearance of a reallj compound eye, such as is possessed by the generality of Insects in their perfect state. With respect to the other senses, touch, taste, and smell, but little is known except by conjec- ture, and presuming them to exist we can only suppose them to be conferred in the same manner as in the real Insect. Generative —A remarkable difference exists between the Chilognatha and the Scolo- pendroid Centipedes with respect to the posi- tion of the organs of generation. In the former the external openings, both of the male and female genitals, are situated near the anterior extremity of the body, as is the case among the Annelida; whilst in the Chilopodous genera, which exhibit a higher grade of organi- zation, the generative apertures are found in the caudal segment as in the Insects. In Lithobius the structure of these parts is in both sexes very simple. In the male there are three long and convoluted secreting tubes resembling the simplest form of the testis in Insects, wherein, doubtless, the seminal fluid is elaborated. These are united at their termi- nations so as to form a kind of common recep- tacle, from which two tubes proceed to the root of the intromittent organ, at which point they are joined by four smaller auxiliary vessels, which seem to take their origin in masses of fatty substanc
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