Text-book of comparative anatomy . r of sexual glands and originally paired ducts from these glands. First Sub-race or Sub-phylum. Branehiata.—Aquatic animals. With the exception of the anteriorantennae all the appendages are morphologically biramose. Respi-ration cutaneous or by means of gills, which are almost alwaysappendages of the basal joints of the limbs. SINGLE CLASS. Crustacea. First appendage to the Sub-race Branehiata : The Trilobites, Gigantostraca,Hemiaspidae, and Xiphosura. Second appendage to the Sub-race Branehiata: The Pantopoda or Pycno-gonidae. Second Sub-race or Sub-phylum.
Text-book of comparative anatomy . r of sexual glands and originally paired ducts from these glands. First Sub-race or Sub-phylum. Branehiata.—Aquatic animals. With the exception of the anteriorantennae all the appendages are morphologically biramose. Respi-ration cutaneous or by means of gills, which are almost alwaysappendages of the basal joints of the limbs. SINGLE CLASS. Crustacea. First appendage to the Sub-race Branehiata : The Trilobites, Gigantostraca,Hemiaspidae, and Xiphosura. Second appendage to the Sub-race Branehiata: The Pantopoda or Pycno-gonidae. Second Sub-race or Sub-phylum. Tracheata.—Land animals. Limbs not biramose, consisting of asingle row of joints. Respiration by means of trachea? (tubularor book-leaf tracheae). CLASS I. Protracheata. CLASS II. Antennata (Myriapoda and Hexapoda).CLASS III. Chelicerota sive Arachnoidea. Appendage to the Phylum of the Tardigrada or Bear animalcules. 288 VUMlAUA TIVE ANA TOMY CHAP. THE Review. Sub-Class I. Entomostraca. UCL. Fig. 191.—Branchipus stagnalis, male. PI, Anterior an-tenna; ; ao, posterior antenute, seizing antennae with accessoryappendages ; ?<«, unpaired eye ; i, liver ; md (above), mandible ;sd, shell gland ; h, heart or dorsal vessel; oil, slit-like apertures(ostia) of the heart; md (below), intestine ; ji, penis ; 6r, branchialsac ; 6rb branchial leaflet; po, paired stalked eyes (after Glaus). The trunk consists of avarying number of can here often distin-guish an anterior divisionbearing limbs from a pos-terior division which hasno such appendages. Eachdivision, however, consists ofa varying number of seg-ments. The genital aper-tures usually lie between thetwo divisions of the dorsal shield is oftenpresent, and is developed invarious ways. The limbsare very variously the usual lateraleyes, the unpaired frontaleye of the Nauplius larva isretained by the adult masticatory stomach iswanting. A Nauplius larv
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
